[Other]: Bug with gh command

### Description

Creating pull requests page - gh command does not exist.

### Why this is important?

This is important because this page is not possible without the gh command (when using git bash), users are forced to create a pull request using one of the other methods provided.

Start with the creating pull requests page and reproduce the documented gh command in Git Bash. The issue names no file or test, so first locate that page and determine what users should see when the command is unavailable; done means the pull-request instructions work in Git Bash or clearly provide an available alternative.

Written by the indexing model from the issue text.