message: chore(pr): updating pr template instructions
  ### Related Ticket(s)
  No related issue
  ### Description
  React and Web Component deploy previews are now enabled
  by default. This is updating the instructions in the
  pull request template.
  ### Changelog
  **Changed**
  updated `PULL_REQUEST_TEMPLATE.md`
diff: - {{removed thing}}
  -<!-- Deploy Previews are enabled by applying the following labels for the corresponding package: -->
  -<!-- *** "package: react": React -->
  -<!-- *** "package: web components": Web Components -->
  +<!-- React and Web Component deploy previews are enabled by default. -->
  +<!-- To enable additional available deploy previews, apply the following -->
  +<!-- labels for the corresponding package: -->
  <!-- *** "package: vanilla": Vanilla -->
  <!-- *** "package: services": Services -->
  <!-- *** "package: utilities": Utilities -->
  