Fix buckconfig documentation formatting error caused by // treated as comment
Fix buckconfig documentation formatting error caused by // treated as comment

Summary:In my diff
`Perf: ~200x speedup by using Watchman to search for BUCK files instead of crawling filesystem`,
I introduced an error into `buckconfig.soy` which caused a `<code>` markup block to be
unterminated.

The issue is that Soyweb docs use Closure template syntax, which treats `//` preceded by
whitespace as the beginning of a single-line comment:

https://developers.google.com/closure/templates/docs/concepts

That meant this:

     <code>buck build //path/to/...</code>.)

was turned into this:

     <code>buck build

so the `<code>` block was never terminated.

This fixes the error by using a `{literal}` block to ignore the `//` preceded by
whitespace.

Test Plan:`./docs/soyweb-local.sh`, opened `http://localhost:9111` in a web browser,
confirmed `<code>` markup block in `.buckconfig` section was now terminated correctly.

Reviewed By: bolinfest

fb-gh-sync-id: aa9bf50
shipit-source-id: aa9bf50

robbertvanginkel/buck,darkforestzero/buck,marcinkwiatkowski/buck,rowillia/buck,SeleniumHQ/buck,zhan-xiong/buck,SeleniumHQ/buck,facebook/buck,grumpyjames/buck,vschs007/buck,nguyentruongtho/buck,vschs007/buck,JoelMarcey/buck,justinmuller/buck,brettwooldridge/buck,sdwilsh/buck,daedric/buck,rowillia/buck,mikekap/buck,nguyentruongtho/buck,daedric/buck,k21/buck,SeleniumHQ/buck,OkBuilds/buck,vschs007/buck,rmaz/buck,illicitonion/buck,clonetwin26/buck,robbertvanginkel/buck,romanoid/buck,brettwooldridge/buck,robbertvanginkel/buck,rowillia/buck,grumpyjames/buck,dsyang/buck,Dominator008/buck,LegNeato/buck,Dominator008/buck,janicduplessis/buck,vschs007/buck,JoelMarcey/buck,shs96c/buck,zpao/buck,darkforestzero/buck,clonetwin26/buck,OkBuilds/buck,bocon13/buck,marcinkwiatkowski/buck,justinmuller/buck,shs96c/buck,illicitonion/buck,Addepar/buck,k21/buck,zhan-xiong/buck,davido/buck,LegNeato/buck,davido/buck,raviagarwal7/buck,JoelMarcey/buck,LegNeato/buck,JoelMarcey/buck,romanoid/buck,rowillia/buck,marcinkwiatkowski/buck,daedric/buck,illicitonion/buck,shybovycha/buck,rmaz/buck,davido/buck,dsyang/buck,illicitonion/buck,shs96c/buck,dsyang/buck,marcinkwiatkowski/buck,raviagarwal7/buck,davido/buck,sdwilsh/buck,facebook/buck,facebook/buck,justinmuller/buck,rowillia/buck,mikekap/buck,davido/buck,ilya-klyuchnikov/buck,k21/buck,zhan-xiong/buck,sdwilsh/buck,zpao/buck,raviagarwal7/buck,zpao/buck,bocon13/buck,daedric/buck,zpao/buck,vschs007/buck,raviagarwal7/buck,rmaz/buck,raviagarwal7/buck,brettwooldridge/buck,robbertvanginkel/buck,vschs007/buck,darkforestzero/buck,k21/buck,clonetwin26/buck,justinmuller/buck,bocon13/buck,bocon13/buck,LegNeato/buck,brettwooldridge/buck,Dominator008/buck,romanoid/buck,clonetwin26/buck,k21/buck,LegNeato/buck,justinmuller/buck,LegNeato/buck,zhan-xiong/buck,daedric/buck,shs96c/buck,grumpyjames/buck,shybovycha/buck,mikekap/buck,janicduplessis/buck,ilya-klyuchnikov/buck,kageiit/buck,Addepar/buck,darkforestzero/buck,daedric/buck,marcinkwiatkowski/buck,daedric/buck,rowillia/buck,marcinkwiatkowski/buck,mikekap/buck,bocon13/buck,mikekap/buck,robbertvanginkel/buck,shs96c/buck,marcinkwiatkowski/buck,illicitonion/buck,OkBuilds/buck,JoelMarcey/buck,rmaz/buck,raviagarwal7/buck,OkBuilds/buck,Addepar/buck,kageiit/buck,davido/buck,brettwooldridge/buck,Dominator008/buck,janicduplessis/buck,rowillia/buck,clonetwin26/buck,rmaz/buck,rmaz/buck,rowillia/buck,shybovycha/buck,robbertvanginkel/buck,shybovycha/buck,shybovycha/buck,dsyang/buck,OkBuilds/buck,LegNeato/buck,daedric/buck,zpao/buck,OkBuilds/buck,rowillia/buck,illicitonion/buck,robbertvanginkel/buck,clonetwin26/buck,SeleniumHQ/buck,romanoid/buck,janicduplessis/buck,clonetwin26/buck,romanoid/buck,facebook/buck,JoelMarcey/buck,dsyang/buck,daedric/buck,k21/buck,justinmuller/buck,LegNeato/buck,davido/buck,ilya-klyuchnikov/buck,ilya-klyuchnikov/buck,nguyentruongtho/buck,clonetwin26/buck,dsyang/buck,ilya-klyuchnikov/buck,LegNeato/buck,Addepar/buck,bocon13/buck,shs96c/buck,OkBuilds/buck,sdwilsh/buck,darkforestzero/buck,mikekap/buck,JoelMarcey/buck,JoelMarcey/buck,romanoid/buck,robbertvanginkel/buck,k21/buck,Dominator008/buck,brettwooldridge/buck,sdwilsh/buck,dsyang/buck,nguyentruongtho/buck,raviagarwal7/buck,shybovycha/buck,romanoid/buck,OkBuilds/buck,marcinkwiatkowski/buck,kageiit/buck,bocon13/buck,illicitonion/buck,darkforestzero/buck,OkBuilds/buck,davido/buck,Addepar/buck,daedric/buck,marcinkwiatkowski/buck,vschs007/buck,shs96c/buck,janicduplessis/buck,grumpyjames/buck,kageiit/buck,JoelMarcey/buck,robbertvanginkel/buck,shs96c/buck,raviagarwal7/buck,LegNeato/buck,grumpyjames/buck,ilya-klyuchnikov/buck,romanoid/buck,clonetwin26/buck,SeleniumHQ/buck,OkBuilds/buck,Addepar/buck,facebook/buck,clonetwin26/buck,vschs007/buck,rmaz/buck,romanoid/buck,zhan-xiong/buck,shs96c/buck,SeleniumHQ/buck,raviagarwal7/buck,vschs007/buck,ilya-klyuchnikov/buck,SeleniumHQ/buck,brettwooldridge/buck,zhan-xiong/buck,zhan-xiong/buck,romanoid/buck,k21/buck,Dominator008/buck,ilya-klyuchnikov/buck,shybovycha/buck,shybovycha/buck,romanoid/buck,dsyang/buck,janicduplessis/buck,sdwilsh/buck,brettwooldridge/buck,brettwooldridge/buck,grumpyjames/buck,illicitonion/buck,clonetwin26/buck,rowillia/buck,ilya-klyuchnikov/buck,davido/buck,shs96c/buck,dsyang/buck,rmaz/buck,Dominator008/buck,justinmuller/buck,janicduplessis/buck,zhan-xiong/buck,robbertvanginkel/buck,bocon13/buck,janicduplessis/buck,zpao/buck,grumpyjames/buck,bocon13/buck,marcinkwiatkowski/buck,grumpyjames/buck,sdwilsh/buck,facebook/buck,illicitonion/buck,robbertvanginkel/buck,rmaz/buck,vschs007/buck,SeleniumHQ/buck,sdwilsh/buck,darkforestzero/buck,brettwooldridge/buck,dsyang/buck,rmaz/buck,justinmuller/buck,Addepar/buck,justinmuller/buck,k21/buck,shybovycha/buck,bocon13/buck,SeleniumHQ/buck,romanoid/buck,dsyang/buck,sdwilsh/buck,davido/buck,darkforestzero/buck,k21/buck,facebook/buck,Addepar/buck,brettwooldridge/buck,rowillia/buck,darkforestzero/buck,davido/buck,LegNeato/buck,kageiit/buck,nguyentruongtho/buck,vschs007/buck,zhan-xiong/buck,k21/buck,LegNeato/buck,janicduplessis/buck,clonetwin26/buck,Dominator008/buck,darkforestzero/buck,illicitonion/buck,vschs007/buck,JoelMarcey/buck,mikekap/buck,mikekap/buck,Addepar/buck,SeleniumHQ/buck,rmaz/buck,romanoid/buck,daedric/buck,robbertvanginkel/buck,bocon13/buck,bocon13/buck,ilya-klyuchnikov/buck,shybovycha/buck,daedric/buck,JoelMarcey/buck,Dominator008/buck,Addepar/buck,illicitonion/buck,mikekap/buck,OkBuilds/buck,OkBuilds/buck,kageiit/buck,raviagarwal7/buck,zhan-xiong/buck,davido/buck,mikekap/buck,dsyang/buck,shybovycha/buck,Dominator008/buck,marcinkwiatkowski/buck,darkforestzero/buck,rowillia/buck,robbertvanginkel/buck,marcinkwiatkowski/buck,SeleniumHQ/buck,k21/buck,k21/buck,sdwilsh/buck,illicitonion/buck,zhan-xiong/buck,shybovycha/buck,JoelMarcey/buck,grumpyjames/buck,sdwilsh/buck,nguyentruongtho/buck,janicduplessis/buck,zpao/buck,rmaz/buck,brettwooldridge/buck,darkforestzero/buck,OkBuilds/buck,shs96c/buck,sdwilsh/buck,Dominator008/buck,SeleniumHQ/buck,raviagarwal7/buck,ilya-klyuchnikov/buck,grumpyjames/buck,mikekap/buck,daedric/buck,kageiit/buck,zhan-xiong/buck,janicduplessis/buck,shs96c/buck,zhan-xiong/buck,justinmuller/buck,sdwilsh/buck,justinmuller/buck,justinmuller/buck,LegNeato/buck,darkforestzero/buck,clonetwin26/buck,dsyang/buck,JoelMarcey/buck,SeleniumHQ/buck,shs96c/buck,ilya-klyuchnikov/buck,shybovycha/buck,marcinkwiatkowski/buck,grumpyjames/buck,grumpyjames/buck,nguyentruongtho/buck,justinmuller/buck,Addepar/buck,raviagarwal7/buck,brettwooldridge/buck,rmaz/buck,ilya-klyuchnikov/buck,Dominator008/buck,davido/buck,mikekap/buck,Addepar/buck,vschs007/buck,Addepar/buck,janicduplessis/buck,illicitonion/buck,raviagarwal7/buck