[openssl/web] 600dc0: Move $(H_DOCS) into $(SIMPLEDOCS)

[Richard Levitte]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/web
  Commit: 600dc0a4ff4669ec537bfb350900f5cd80a5630e
      https://github.com/openssl/web/commit/600dc0a4ff4669ec537bfb350900f5cd80a5630e
  Author: Richard Levitte <levitte at openssl.org>
  Date:   2022-07-25 (Mon, 25 Jul 2022)

  Changed paths:
    M Makefile

  Log Message:
  -----------
  Move $(H_DOCS) into $(SIMPLEDOCS)

This allows more complete separate building of documentation.

Reviewed-by: Matt Caswell <matt at openssl.org>
(Merged from https://github.com/openssl/web/pull/356)