Update build-pkg-from-source.rst
Update build-pkg-from-source.rst

[no bug] fix typo in docs
rhelmer/socorro,linearregression/socorro,rhelmer/socorro,Tchanders/socorro,spthaolt/socorro,linearregression/socorro,Serg09/socorro,KaiRo-at/socorro,rhelmer/socorro,linearregression/socorro,KaiRo-at/socorro,Serg09/socorro,AdrianGaudebert/socorro,adngdb/socorro,pcabido/socorro,linearregression/socorro,Tchanders/socorro,spthaolt/socorro,spthaolt/socorro,luser/socorro,Serg09/socorro,luser/socorro,KaiRo-at/socorro,twobraids/socorro,pcabido/socorro,adngdb/socorro,pcabido/socorro,adngdb/socorro,cliqz/socorro,adngdb/socorro,AdrianGaudebert/socorro,lonnen/socorro,Tayamarn/socorro,luser/socorro,Serg09/socorro,Tchanders/socorro,lonnen/socorro,pcabido/socorro,luser/socorro,Tayamarn/socorro,m8ttyB/socorro,Tayamarn/socorro,twobraids/socorro,lonnen/socorro,rhelmer/socorro,Tayamarn/socorro,Tchanders/socorro,mozilla/socorro,mozilla/socorro,spthaolt/socorro,linearregression/socorro,m8ttyB/socorro,cliqz/socorro,KaiRo-at/socorro,m8ttyB/socorro,rhelmer/socorro,adngdb/socorro,AdrianGaudebert/socorro,Tchanders/socorro,twobraids/socorro,AdrianGaudebert/socorro,yglazko/socorro,yglazko/socorro,Tchanders/socorro,pcabido/socorro,yglazko/socorro,cliqz/socorro,spthaolt/socorro,AdrianGaudebert/socorro,KaiRo-at/socorro,cliqz/socorro,m8ttyB/socorro,twobraids/socorro,cliqz/socorro,linearregression/socorro,pcabido/socorro,m8ttyB/socorro,mozilla/socorro,Serg09/socorro,Tayamarn/socorro,twobraids/socorro,luser/socorro,m8ttyB/socorro,Serg09/socorro,mozilla/socorro,yglazko/socorro,mozilla/socorro,Tayamarn/socorro,yglazko/socorro,spthaolt/socorro,mozilla/socorro,KaiRo-at/socorro,luser/socorro,yglazko/socorro,twobraids/socorro,cliqz/socorro,adngdb/socorro,AdrianGaudebert/socorro,lonnen/socorro,rhelmer/socorro