Update Bitbucket callback URL documentation
Update Bitbucket callback URL documentation

Closes #25950

[ci skip]

stoplightio/gitlabhq,axilleas/gitlabhq,openwide-java/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,jirutka/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,iiet/iiet-git,t-zuehlsdorff/gitlabhq,openwide-java/gitlabhq,LUMC/gitlabhq,axilleas/gitlabhq,stoplightio/gitlabhq,darkrasid/gitlabhq,dplarson/gitlabhq,t-zuehlsdorff/gitlabhq,LUMC/gitlabhq,htve/GitlabForChinese,mmkassem/gitlabhq,dplarson/gitlabhq,jirutka/gitlabhq,darkrasid/gitlabhq,mmkassem/gitlabhq,htve/GitlabForChinese,t-zuehlsdorff/gitlabhq,openwide-java/gitlabhq,htve/GitlabForChinese,mmkassem/gitlabhq,dreampet/gitlab,dplarson/gitlabhq,darkrasid/gitlabhq,mmkassem/gitlabhq,openwide-java/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,dplarson/gitlabhq,htve/GitlabForChinese,t-zuehlsdorff/gitlabhq,iiet/iiet-git,dreampet/gitlab,LUMC/gitlabhq,darkrasid/gitlabhq,jirutka/gitlabhq,jirutka/gitlabhq,LUMC/gitlabhq