Fix --filter documentation
Fix --filter documentation

Summary:
You used to be able to list filters multiple times with the filter option:

  $ buck test --filter a b c

That changed in {D1196948}, so now you have to do this instead:

  $ buck test --filter a -filter b --filter c

This diff updates the help test to reflect that change.

Test Plan: Run `buck test --help`.

davido/buck,rowillia/buck,dpursehouse/buck,zhan-xiong/buck,robbertvanginkel/buck,shybovycha/buck,mread/buck,vschs007/buck,justinmuller/buck,dsyang/buck,romanoid/buck,grumpyjames/buck,JoelMarcey/buck,dpursehouse/buck,JoelMarcey/buck,JoelMarcey/buck,Dominator008/buck,raviagarwal7/buck,shybovycha/buck,shs96c/buck,justinmuller/buck,MarkRunWu/buck,shs96c/buck,grumpyjames/buck,shs96c/buck,SeleniumHQ/buck,bocon13/buck,sdwilsh/buck,hgl888/buck,romanoid/buck,shybovycha/buck,saleeh93/buck-cutom,Addepar/buck,raviagarwal7/buck,daedric/buck,daedric/buck,clonetwin26/buck,marcinkwiatkowski/buck,raviagarwal7/buck,bocon13/buck,JoelMarcey/buck,tgummerer/buck,SeleniumHQ/buck,JoelMarcey/buck,tgummerer/buck,marcinkwiatkowski/buck,sdwilsh/buck,dsyang/buck,rowillia/buck,illicitonion/buck,romanoid/buck,janicduplessis/buck,rhencke/buck,zpao/buck,mnuessler/buck,zhan-xiong/buck,davido/buck,facebook/buck,sdwilsh/buck,rhencke/buck,marcinkwiatkowski/buck,brettwooldridge/buck,nguyentruongtho/buck,siddhartharay007/buck,vschs007/buck,zpao/buck,JoelMarcey/buck,rhencke/buck,Addepar/buck,saleeh93/buck-cutom,janicduplessis/buck,vine/buck,shs96c/buck,davido/buck,facebook/buck,OkBuilds/buck,liuyang-li/buck,davido/buck,lukw00/buck,raviagarwal7/buck,OkBuilds/buck,mikekap/buck,nguyentruongtho/buck,zhan-xiong/buck,shybovycha/buck,zhuxiaohao/buck,dushmis/buck,rhencke/buck,dpursehouse/buck,dushmis/buck,k21/buck,robbertvanginkel/buck,k21/buck,MarkRunWu/buck,neonichu/buck,vschs007/buck,vschs007/buck,1yvT0s/buck,MarkRunWu/buck,1yvT0s/buck,OkBuilds/buck,k21/buck,neonichu/buck,shybovycha/buck,ilya-klyuchnikov/buck,darkforestzero/buck,dushmis/buck,vine/buck,JoelMarcey/buck,Learn-Android-app/buck,Distrotech/buck,marcinkwiatkowski/buck,dsyang/buck,vine/buck,mikekap/buck,rmaz/buck,ilya-klyuchnikov/buck,romanoid/buck,Dominator008/buck,brettwooldridge/buck,grumpyjames/buck,LegNeato/buck,siddhartharay007/buck,dpursehouse/buck,LegNeato/buck,illicitonion/buck,JoelMarcey/buck,Addepar/buck,ilya-klyuchnikov/buck,mogers/buck,brettwooldridge/buck,illicitonion/buck,shybovycha/buck,Heart2009/buck,grumpyjames/buck,1yvT0s/buck,janicduplessis/buck,justinmuller/buck,lukw00/buck,Addepar/buck,mogers/buck,darkforestzero/buck,zpao/buck,daedric/buck,liuyang-li/buck,justinmuller/buck,MarkRunWu/buck,MarkRunWu/buck,mread/buck,dsyang/buck,Heart2009/buck,dsyang/buck,daedric/buck,Heart2009/buck,tgummerer/buck,ilya-klyuchnikov/buck,OkBuilds/buck,dsyang/buck,robbertvanginkel/buck,bocon13/buck,stuhood/buck,grumpyjames/buck,artiya4u/buck,sdwilsh/buck,rowillia/buck,Distrotech/buck,vschs007/buck,pwz3n0/buck,rmaz/buck,rmaz/buck,Heart2009/buck,daedric/buck,zhuxiaohao/buck,brettwooldridge/buck,brettwooldridge/buck,vine/buck,OkBuilds/buck,liuyang-li/buck,shs96c/buck,stuhood/buck,vschs007/buck,marcinkwiatkowski/buck,daedric/buck,ilya-klyuchnikov/buck,marcinkwiatkowski/buck,vschs007/buck,hgl888/buck,Learn-Android-app/buck,shybovycha/buck,1yvT0s/buck,vschs007/buck,pwz3n0/buck,shybovycha/buck,pwz3n0/buck,Distrotech/buck,grumpyjames/buck,stuhood/buck,robbertvanginkel/buck,zhan-xiong/buck,dsyang/buck,sdwilsh/buck,Distrotech/buck,artiya4u/buck,lukw00/buck,romanoid/buck,clonetwin26/buck,robbertvanginkel/buck,mogers/buck,raviagarwal7/buck,grumpyjames/buck,neonichu/buck,shybovycha/buck,dsyang/buck,davido/buck,illicitonion/buck,luiseduardohdbackup/buck,luiseduardohdbackup/buck,shs96c/buck,Addepar/buck,dushmis/buck,JoelMarcey/buck,bocon13/buck,vine/buck,romanoid/buck,siddhartharay007/buck,illicitonion/buck,saleeh93/buck-cutom,darkforestzero/buck,rmaz/buck,brettwooldridge/buck,mogers/buck,luiseduardohdbackup/buck,Dominator008/buck,OkBuilds/buck,shs96c/buck,janicduplessis/buck,SeleniumHQ/buck,mnuessler/buck,SeleniumHQ/buck,romanoid/buck,tgummerer/buck,davido/buck,tgummerer/buck,dushmis/buck,pwz3n0/buck,zhuxiaohao/buck,dsyang/buck,facebook/buck,Dominator008/buck,rowillia/buck,rmaz/buck,rmaz/buck,illicitonion/buck,lukw00/buck,hgl888/buck,Heart2009/buck,brettwooldridge/buck,mikekap/buck,justinmuller/buck,kageiit/buck,SeleniumHQ/buck,stuhood/buck,brettwooldridge/buck,mread/buck,tgummerer/buck,mogers/buck,1yvT0s/buck,mogers/buck,liuyang-li/buck,siddhartharay007/buck,shybovycha/buck,luiseduardohdbackup/buck,shs96c/buck,siddhartharay007/buck,LegNeato/buck,dushmis/buck,mogers/buck,Distrotech/buck,Distrotech/buck,justinmuller/buck,darkforestzero/buck,JoelMarcey/buck,zhan-xiong/buck,Learn-Android-app/buck,raviagarwal7/buck,daedric/buck,zhan-xiong/buck,rmaz/buck,Dominator008/buck,k21/buck,tgummerer/buck,siddhartharay007/buck,Learn-Android-app/buck,zhuxiaohao/buck,sdwilsh/buck,vschs007/buck,janicduplessis/buck,darkforestzero/buck,clonetwin26/buck,Addepar/buck,zhuxiaohao/buck,1yvT0s/buck,neonichu/buck,siddhartharay007/buck,raviagarwal7/buck,daedric/buck,mnuessler/buck,davido/buck,rmaz/buck,robbertvanginkel/buck,kageiit/buck,daedric/buck,artiya4u/buck,raviagarwal7/buck,vine/buck,shybovycha/buck,illicitonion/buck,rmaz/buck,brettwooldridge/buck,sdwilsh/buck,Learn-Android-app/buck,zhan-xiong/buck,Addepar/buck,robbertvanginkel/buck,robbertvanginkel/buck,JoelMarcey/buck,zhan-xiong/buck,robbertvanginkel/buck,clonetwin26/buck,justinmuller/buck,stuhood/buck,bocon13/buck,sdwilsh/buck,davido/buck,darkforestzero/buck,marcinkwiatkowski/buck,illicitonion/buck,liuyang-li/buck,siddhartharay007/buck,artiya4u/buck,brettwooldridge/buck,shs96c/buck,pwz3n0/buck,bocon13/buck,mikekap/buck,pwz3n0/buck,rowillia/buck,Heart2009/buck,neonichu/buck,ilya-klyuchnikov/buck,Learn-Android-app/buck,brettwooldridge/buck,neonichu/buck,neonichu/buck,lukw00/buck,JoelMarcey/buck,pwz3n0/buck,Addepar/buck,robbertvanginkel/buck,davido/buck,mikekap/buck,kageiit/buck,pwz3n0/buck,Heart2009/buck,k21/buck,LegNeato/buck,k21/buck,Distrotech/buck,Distrotech/buck,liuyang-li/buck,mikekap/buck,Addepar/buck,kageiit/buck,sdwilsh/buck,dushmis/buck,liuyang-li/buck,mikekap/buck,justinmuller/buck,sdwilsh/buck,Addepar/buck,vine/buck,raviagarwal7/buck,mikekap/buck,daedric/buck,1yvT0s/buck,marcinkwiatkowski/buck,k21/buck,marcinkwiatkowski/buck,mread/buck,Learn-Android-app/buck,hgl888/buck,rowillia/buck,zhuxiaohao/buck,romanoid/buck,luiseduardohdbackup/buck,vine/buck,Learn-Android-app/buck,davido/buck,k21/buck,Dominator008/buck,rowillia/buck,Distrotech/buck,OkBuilds/buck,kageiit/buck,romanoid/buck,brettwooldridge/buck,ilya-klyuchnikov/buck,liuyang-li/buck,romanoid/buck,vine/buck,darkforestzero/buck,mnuessler/buck,dpursehouse/buck,vschs007/buck,raviagarwal7/buck,Dominator008/buck,rowillia/buck,hgl888/buck,rmaz/buck,davido/buck,MarkRunWu/buck,SeleniumHQ/buck,clonetwin26/buck,vine/buck,facebook/buck,MarkRunWu/buck,darkforestzero/buck,grumpyjames/buck,mogers/buck,OkBuilds/buck,Learn-Android-app/buck,rhencke/buck,SeleniumHQ/buck,marcinkwiatkowski/buck,clonetwin26/buck,Dominator008/buck,darkforestzero/buck,LegNeato/buck,ilya-klyuchnikov/buck,shybovycha/buck,k21/buck,facebook/buck,pwz3n0/buck,LegNeato/buck,raviagarwal7/buck,kageiit/buck,rmaz/buck,clonetwin26/buck,SeleniumHQ/buck,hgl888/buck,lukw00/buck,nguyentruongtho/buck,bocon13/buck,romanoid/buck,rowillia/buck,rhencke/buck,ilya-klyuchnikov/buck,zhan-xiong/buck,rhencke/buck,zpao/buck,marcinkwiatkowski/buck,neonichu/buck,mnuessler/buck,justinmuller/buck,janicduplessis/buck,janicduplessis/buck,rmaz/buck,OkBuilds/buck,JoelMarcey/buck,nguyentruongtho/buck,SeleniumHQ/buck,k21/buck,stuhood/buck,nguyentruongtho/buck,dpursehouse/buck,OkBuilds/buck,clonetwin26/buck,zhan-xiong/buck,janicduplessis/buck,artiya4u/buck,dushmis/buck,SeleniumHQ/buck,dsyang/buck,robbertvanginkel/buck,mogers/buck,bocon13/buck,clonetwin26/buck,Dominator008/buck,mikekap/buck,raviagarwal7/buck,zhan-xiong/buck,nguyentruongtho/buck,stuhood/buck,clonetwin26/buck,OkBuilds/buck,dsyang/buck,rhencke/buck,Addepar/buck,stuhood/buck,dushmis/buck,daedric/buck,ilya-klyuchnikov/buck,mikekap/buck,OkBuilds/buck,rowillia/buck,Heart2009/buck,stuhood/buck,LegNeato/buck,LegNeato/buck,stuhood/buck,illicitonion/buck,justinmuller/buck,ilya-klyuchnikov/buck,zhuxiaohao/buck,robbertvanginkel/buck,Dominator008/buck,mnuessler/buck,facebook/buck,1yvT0s/buck,shybovycha/buck,LegNeato/buck,artiya4u/buck,zhuxiaohao/buck,tgummerer/buck,luiseduardohdbackup/buck,LegNeato/buck,brettwooldridge/buck,grumpyjames/buck,rhencke/buck,hgl888/buck,zpao/buck,janicduplessis/buck,janicduplessis/buck,clonetwin26/buck,lukw00/buck,davido/buck,LegNeato/buck,grumpyjames/buck,mogers/buck,illicitonion/buck,marcinkwiatkowski/buck,MarkRunWu/buck,illicitonion/buck,darkforestzero/buck,k21/buck,k21/buck,kageiit/buck,neonichu/buck,SeleniumHQ/buck,lukw00/buck,zhan-xiong/buck,shs96c/buck,illicitonion/buck,lukw00/buck,rhencke/buck,saleeh93/buck-cutom,darkforestzero/buck,liuyang-li/buck,artiya4u/buck,tgummerer/buck,mnuessler/buck,clonetwin26/buck,mnuessler/buck,siddhartharay007/buck,tgummerer/buck,davido/buck,artiya4u/buck,zhuxiaohao/buck,artiya4u/buck,Learn-Android-app/buck,liuyang-li/buck,darkforestzero/buck,artiya4u/buck,sdwilsh/buck,mread/buck,tgummerer/buck,stuhood/buck,ilya-klyuchnikov/buck,zhan-xiong/buck,Distrotech/buck,pwz3n0/buck,SeleniumHQ/buck,janicduplessis/buck,nguyentruongtho/buck,shs96c/buck,marcinkwiatkowski/buck,bocon13/buck,illicitonion/buck,Distrotech/buck,OkBuilds/buck,sdwilsh/buck,romanoid/buck,bocon13/buck,artiya4u/buck,SeleniumHQ/buck,robbertvanginkel/buck,Addepar/buck,sdwilsh/buck,LegNeato/buck,hgl888/buck,Addepar/buck,mread/buck,luiseduardohdbackup/buck,dpursehouse/buck,hgl888/buck,mikekap/buck,dsyang/buck,shs96c/buck,Dominator008/buck,rowillia/buck,liuyang-li/buck,zpao/buck,grumpyjames/buck,lukw00/buck,mnuessler/buck,Learn-Android-app/buck,ilya-klyuchnikov/buck,Heart2009/buck,saleeh93/buck-cutom,bocon13/buck,bocon13/buck,vine/buck,lukw00/buck,dpursehouse/buck,zpao/buck,k21/buck,justinmuller/buck,justinmuller/buck,saleeh93/buck-cutom,luiseduardohdbackup/buck,darkforestzero/buck,rowillia/buck,raviagarwal7/buck,mogers/buck,shs96c/buck,justinmuller/buck,romanoid/buck,rmaz/buck,dsyang/buck,LegNeato/buck,facebook/buck,grumpyjames/buck,vschs007/buck,luiseduardohdbackup/buck,rhencke/buck,janicduplessis/buck,pwz3n0/buck,vschs007/buck,dushmis/buck,Dominator008/buck,clonetwin26/buck,daedric/buck,mikekap/buck,daedric/buck,1yvT0s/buck,vschs007/buck