Follow-up from "Neovim: Stub out Vim auto-command section"

The following discussion from !163214 (merged) should be addressed:

• @aqualls started a discussion: (+1 comment)

  
  ## Edit resources in GitLab
  
  Enable the `gitlab.resource_editing` to enable:
  
  1. Use `:edit https://gitlab.com/RESOURCE_URL` to open a buffer with the
     description of an epic, issue, or merge request.
  1. Saving the buffer with `:w` will update the resource's Markdown description.
  
  ## Install the extension

  This spot isn't the right place, but here's another part of the existing README we should capture

• @erran followed up:

  I’d be happy to contribute a feature list and figure out a different location to document the specific usage like this.

  The Neovim help text is probably reasonable since we document how to use it.