[openssl/openssl] f831ad: contributing-doc: give example commit message with...

[James Muir]

  Branch: refs/heads/openssl-3.2
  Home:   https://github.com/openssl/openssl
  Commit: f831adc00add9e37d730e587f86a0d656b051286
      https://github.com/openssl/openssl/commit/f831adc00add9e37d730e587f86a0d656b051286
  Author: James Muir <james at openssl.org>
  Date:   2023-11-23 (Thu, 23 Nov 2023)

  Changed paths:
    M CONTRIBUTING.md

  Log Message:
  -----------
  contributing-doc: give example commit message with "CLA: trivial"

The text "CLA: trivial" should go at the bottom of the commit message.
Also, update the force-push command to include the repository and
branch, which can avoid unexpected force-push results.

Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre at ncp-e.com>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Hugo Landau <hlandau at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22775)

(cherry picked from commit cad48c5b0f7180c5fab8db70feb07e0846d80d67)