fix(docs): hydration error on js references (#28345)
Our syntax highlighter doesn't recognize HTML (tried to install it but it's not
on the lsit of supported languages) and this somehow causes the server and
client to make different highlighting decisions, with the server attempting to
highlight the code block and the client not.
Removing the html language specifier removes the hydration error (and since the
client never properly highlighted it anyway, we don't lose much in terms of
syntax highlighting.)
