double listing of doc files on ELPA package page

[Stephen Leake]

I finally released a new version of ada-mode, so the ELPA ada-mode web
page was updated (https://elpa.gnu.org/packages/ada-mode.html). It now
contains doc links, as expected. However, each doc is listed twice; the
docs are repeated in :internal--html-docs.

On the other hand, on the devel ada-mode web page
https://elpa.gnu.org/devel/ada-mode.html, the docs are only listed once.
So maybe building those calls elpaa--hmlp-build-doc once, populating
:internal--html-docs, and then elpaa--hmlp-build-doc is called again for
the non-devel?

The same is happening for the "consult" and "empbark" packages, so it's not 
unique to
ada-mode.

For "consult", the linked doc is also the README, so it is
both inlined in the main page and linked. Perhaps :doc should be changed
to :readme in elpa-packages for "consult".

-- 
-- Stephe