git-branch: replace --show-current with --contains example (#6387)

pages/common/git-branch.md

@@ -3,13 +3,13 @@
 > Main Git command for working with branches.
 > More information: <https://git-scm.com/docs/git-branch>.
 
-- List local branches. The current branch is highlighted by `*`:
+- List all branches (local and remote; the current branch is highlighted by `*`):
 
-`git branch`
+`git branch --all`
 
-- List all branches (local and remote):
+- List which branches include a specific Git commit in their history:
 
-`git branch -a`
+`git branch --all --contains {{commit_hash}}`
 
 - Show the name of the current branch: