docs(git): update git.sh

tools/git.sh

@@ -12,6 +12,9 @@ git branch my-branch    # creates my-branch
 git branch -d my-branch # deletes my-branch
 git checkout my-bracnch # switches to my-branch
 git merge my-branch     # merges my-branch to current branch
+git push origin :my-branch         # delete remote branch
+
+git cherry-pick <commit_id>        # merge the specified commit
 
 git remote                         # shows the remotes
 git remote -v                      # shows the remote for pull and push