message: docs(previews): added instructions for enabling deploy previews
diff: **Removed**
  - {{removed thing}}
  +
  +<!-- Deploy Previews are enabled by applying the following labels for the corresponding package: -->
  +<!-- *** "package: react" -->
  +<!-- *** "package: patterns" -->
  +<!-- *** "package: vanilla" -->
  +<!-- *** "package: services" -->
  +<!-- *** "package: utilities" -->
  +<!-- *** "package: styles" -->
  