update mi-github-issues.md (fixes #3548) (#3554)

Author: huitk

pages/mi/mi-github-issues.md

@@ -71,8 +71,12 @@ Before you create your branch, sync your repository with the following commands
 
 - To create and switch to a new branch from `master`, run the following commands:
 
-  ```sh
-  git checkout master  # Ensure you are on the master branch
+  ```
+  # switch to the master branch
+  git checkout master
+
+  # create a new branch from the master branch and swtich to the new branch
+  # avoid using `#` in the branch name to prevent issues with rawgithack preview
   git checkout -b <issueNumber-descriptive-branch-name>
   ```