[openssl/web] 799058: Change news/changelog.md back to changelog.txt

[Richard Levitte]

  Branch: refs/heads/master
  Home:   https://github.openssl.org/openssl/web
  Commit: 79905834dd07275c013857b7cd9b92f14c292e35
      https://github.openssl.org/openssl/web/commit/79905834dd07275c013857b7cd9b92f14c292e35
  Author: Richard Levitte <levitte at openssl.org>
  Date:   2022-05-04 (Wed, 04 May 2022)

  Changed paths:
    M Makefile
    M news/changelog.html.tt

  Log Message:
  -----------
  Change news/changelog.md back to changelog.txt

Changing it to news/changelog.md was a mistake, for multiple reasons,
see the added comment in Makefile

Fixes #322

Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/web/pull/323)