Add javadoc for RuleKeyBuilder#feed(Object)
Add javadoc for RuleKeyBuilder#feed(Object)

Test Plan: CI.

Reviewed By: JonShemitz

fbshipit-source-id: 3eddcd6

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