community: give bug reporting its own section
community: give bug reporting its own section

We already mention bug-reporting as a function of the
mailing list, but a first-time reader looking for
instructions on reporting a bug may skip over the whole
mailing list section. Let's make it easier for them to find
what they're looking for.

beni55/git-scm.com,dscho/git-scm.com,mjhasbach/git-scm.com,beni55/git-scm.com,git/git-scm.com,Croydon/git-scm.com,pwz3n0/git-scm.com,Mokolea/git-scm.com,peterkinalex/git-scm.com,xyztest/git-scm.com,gittower/git-scm.com,Mokolea/git-scm.com,Croydon/git-scm.com,jasonlong/git-scm.com,git/git-scm.com,dotty2883/git-scm.com,jnavila/gitscm-next,dscho/git-scm.com,Belthazor2008/git-scm.com,eyecatchup/git-scm.com,MjAbuz/git-scm.com,Belthazor2008/git-scm.com,git/git-scm.com,empyrical/git-scm.com,Xia-lj/git-scm.com,ThiagoGarciaAlves/git-scm.com,DAKaufman/git-scm.com,mjhasbach/git-scm.com,Belthazor2008/git-scm.com,jnavila/gitscm-next,eyecatchup/git-scm.com,Mokolea/git-scm.com,ThiagoGarciaAlves/git-scm.com,peterkinalex/git-scm.com,Xia-lj/git-scm.com,pwz3n0/git-scm.com,eyecatchup/git-scm.com,jasonlong/git-scm.com,mosoft521/gitscm-next,virgo075/git-scm.com,dotty2883/git-scm.com,jnavila/gitscm-next,empyrical/git-scm.com,beni55/git-scm.com,dscho/git-scm.com,initaldk/git-scm.com,initaldk/git-scm.com,dotty2883/git-scm.com,MjAbuz/git-scm.com,xyztest/git-scm.com,gittower/git-scm.com,dscho/git-scm.com,mahyoub/git-scm.com,beni55/git-scm.com,DAKaufman/git-scm.com,initaldk/git-scm.com,git/git-scm.com,gittower/git-scm.com,mahyoub/git-scm.com,openhardnudd/git-scm.com,openhardnudd/git-scm.com,peterkinalex/git-scm.com,openhardnudd/git-scm.com,eyecatchup/git-scm.com,mosoft521/gitscm-next,Croydon/git-scm.com,DAKaufman/git-scm.com,mahyoub/git-scm.com,empyrical/git-scm.com,mahyoub/git-scm.com,MjAbuz/git-scm.com,xyztest/git-scm.com,mjhasbach/git-scm.com,Xia-lj/git-scm.com,Xia-lj/git-scm.com,virgo075/git-scm.com,peterkinalex/git-scm.com,xyztest/git-scm.com,initaldk/git-scm.com,pwz3n0/git-scm.com,jasonlong/git-scm.com,mosoft521/gitscm-next,mosoft521/gitscm-next,jasonlong/git-scm.com,virgo075/git-scm.com,ThiagoGarciaAlves/git-scm.com,Croydon/git-scm.com,MjAbuz/git-scm.com,dotty2883/git-scm.com,openhardnudd/git-scm.com,ThiagoGarciaAlves/git-scm.com,pwz3n0/git-scm.com,jnavila/gitscm-next,mjhasbach/git-scm.com,virgo075/git-scm.com,gittower/git-scm.com,empyrical/git-scm.com,Belthazor2008/git-scm.com,DAKaufman/git-scm.com,Mokolea/git-scm.com