Add documentation for the "client" config options.
Add documentation for the "client" config options.

Summary: This adds documentation for `client.id` and `client.skip-action-graph-cache=true`.

Test Plan: Previewed in http://localhost:9811/concept/buckconfig.html#client; looks great!

Reviewed By: illicitonion

fbshipit-source-id: bc6fd80

k21/buck,vschs007/buck,JoelMarcey/buck,romanoid/buck,ilya-klyuchnikov/buck,ilya-klyuchnikov/buck,brettwooldridge/buck,grumpyjames/buck,vschs007/buck,facebook/buck,dsyang/buck,dsyang/buck,SeleniumHQ/buck,shs96c/buck,JoelMarcey/buck,darkforestzero/buck,clonetwin26/buck,marcinkwiatkowski/buck,grumpyjames/buck,zhan-xiong/buck,marcinkwiatkowski/buck,zhan-xiong/buck,grumpyjames/buck,nguyentruongtho/buck,LegNeato/buck,clonetwin26/buck,darkforestzero/buck,zhan-xiong/buck,LegNeato/buck,k21/buck,romanoid/buck,grumpyjames/buck,k21/buck,brettwooldridge/buck,ilya-klyuchnikov/buck,robbertvanginkel/buck,kageiit/buck,zpao/buck,SeleniumHQ/buck,clonetwin26/buck,JoelMarcey/buck,darkforestzero/buck,shybovycha/buck,LegNeato/buck,marcinkwiatkowski/buck,k21/buck,zhan-xiong/buck,k21/buck,kageiit/buck,facebook/buck,rmaz/buck,vschs007/buck,JoelMarcey/buck,robbertvanginkel/buck,rmaz/buck,Addepar/buck,Addepar/buck,grumpyjames/buck,marcinkwiatkowski/buck,shybovycha/buck,k21/buck,JoelMarcey/buck,zpao/buck,shs96c/buck,darkforestzero/buck,shybovycha/buck,darkforestzero/buck,ilya-klyuchnikov/buck,marcinkwiatkowski/buck,LegNeato/buck,facebook/buck,JoelMarcey/buck,clonetwin26/buck,romanoid/buck,vschs007/buck,SeleniumHQ/buck,Addepar/buck,JoelMarcey/buck,ilya-klyuchnikov/buck,dsyang/buck,brettwooldridge/buck,kageiit/buck,marcinkwiatkowski/buck,k21/buck,clonetwin26/buck,SeleniumHQ/buck,romanoid/buck,grumpyjames/buck,clonetwin26/buck,rmaz/buck,Addepar/buck,grumpyjames/buck,shybovycha/buck,robbertvanginkel/buck,ilya-klyuchnikov/buck,zhan-xiong/buck,dsyang/buck,nguyentruongtho/buck,zpao/buck,vschs007/buck,SeleniumHQ/buck,LegNeato/buck,darkforestzero/buck,brettwooldridge/buck,shybovycha/buck,brettwooldridge/buck,darkforestzero/buck,romanoid/buck,brettwooldridge/buck,SeleniumHQ/buck,zpao/buck,robbertvanginkel/buck,brettwooldridge/buck,JoelMarcey/buck,robbertvanginkel/buck,robbertvanginkel/buck,shs96c/buck,Addepar/buck,brettwooldridge/buck,Addepar/buck,grumpyjames/buck,grumpyjames/buck,marcinkwiatkowski/buck,zhan-xiong/buck,Addepar/buck,robbertvanginkel/buck,nguyentruongtho/buck,rmaz/buck,k21/buck,zhan-xiong/buck,SeleniumHQ/buck,zhan-xiong/buck,Addepar/buck,zpao/buck,rmaz/buck,darkforestzero/buck,dsyang/buck,marcinkwiatkowski/buck,JoelMarcey/buck,shs96c/buck,dsyang/buck,shs96c/buck,LegNeato/buck,romanoid/buck,JoelMarcey/buck,facebook/buck,ilya-klyuchnikov/buck,k21/buck,grumpyjames/buck,romanoid/buck,rmaz/buck,ilya-klyuchnikov/buck,romanoid/buck,rmaz/buck,vschs007/buck,rmaz/buck,k21/buck,marcinkwiatkowski/buck,dsyang/buck,JoelMarcey/buck,robbertvanginkel/buck,zpao/buck,nguyentruongtho/buck,rmaz/buck,romanoid/buck,rmaz/buck,LegNeato/buck,k21/buck,clonetwin26/buck,LegNeato/buck,romanoid/buck,ilya-klyuchnikov/buck,dsyang/buck,shybovycha/buck,robbertvanginkel/buck,clonetwin26/buck,SeleniumHQ/buck,nguyentruongtho/buck,brettwooldridge/buck,shybovycha/buck,ilya-klyuchnikov/buck,LegNeato/buck,nguyentruongtho/buck,brettwooldridge/buck,grumpyjames/buck,shs96c/buck,robbertvanginkel/buck,vschs007/buck,shybovycha/buck,LegNeato/buck,rmaz/buck,rmaz/buck,kageiit/buck,Addepar/buck,clonetwin26/buck,kageiit/buck,darkforestzero/buck,k21/buck,nguyentruongtho/buck,clonetwin26/buck,clonetwin26/buck,LegNeato/buck,SeleniumHQ/buck,SeleniumHQ/buck,zhan-xiong/buck,vschs007/buck,romanoid/buck,shybovycha/buck,shybovycha/buck,Addepar/buck,shs96c/buck,clonetwin26/buck,shs96c/buck,darkforestzero/buck,JoelMarcey/buck,marcinkwiatkowski/buck,darkforestzero/buck,shybovycha/buck,vschs007/buck,dsyang/buck,LegNeato/buck,facebook/buck,SeleniumHQ/buck,zpao/buck,rmaz/buck,brettwooldridge/buck,dsyang/buck,robbertvanginkel/buck,shs96c/buck,robbertvanginkel/buck,shs96c/buck,shs96c/buck,ilya-klyuchnikov/buck,vschs007/buck,zhan-xiong/buck,Addepar/buck,brettwooldridge/buck,marcinkwiatkowski/buck,vschs007/buck,SeleniumHQ/buck,kageiit/buck,facebook/buck,vschs007/buck,shybovycha/buck,LegNeato/buck,ilya-klyuchnikov/buck,shs96c/buck,dsyang/buck,Addepar/buck,Addepar/buck,shs96c/buck,zhan-xiong/buck,romanoid/buck,zhan-xiong/buck,brettwooldridge/buck,SeleniumHQ/buck,zhan-xiong/buck,grumpyjames/buck,dsyang/buck,darkforestzero/buck,dsyang/buck,romanoid/buck,clonetwin26/buck,kageiit/buck,robbertvanginkel/buck,vschs007/buck,JoelMarcey/buck,ilya-klyuchnikov/buck,shybovycha/buck,k21/buck,marcinkwiatkowski/buck,darkforestzero/buck,facebook/buck,marcinkwiatkowski/buck