Doc-comments incorrectly suggest `web.yml` can be manually run.

[ethanmsl]

I believe the following is required to allow manual activation of a github workflow.

on:
  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

It's is not present in web.yml yet the doc comments in there specifically mention being able to manually run. (You can, of course, also manually trigger a workflow run when you want the docs to update.)

on:
  ...
  # If you only want docs to update with releases, disable this, or change it to
  # a "release" branch. You can, of course, also manually trigger a workflow run
  # when you want the docs to update.
  push:
    branches:
      - main