message: docs: remove techdocs caching caveat
  This has been fixed, and now the cache is managed using an ETag.
diff: @@ -78,11 +78,6 @@ the repository. The archive does not have any git history attached to it. Also
  it is a compressed file. Hence the file size is significantly smaller than how
  much data git clone has to transfer.
  -Caveat: Currently TechDocs sites built using URL Reader will be cached for 30
  -minutes which means they will not be re-built if new changes are made within 30
  -minutes. This cache invalidation will be replaced by commit timestamp based
  -implementation very soon.
  -
  ## How to use a custom TechDocs home page?
  ### 1st way: TechDocsCustomHome with a custom configuration
  