Fix broken sphinx link in software_process.rst

[rly]

Motivation

Sphinx link-check cannot detect/resolve https://github.com/hdmf-dev/hdmf#readme . It seems like GitHub dynamically generates this anchor. This code https://github.com/sphinx-doc/sphinx/blob/master/sphinx/builders/linkcheck.py#L616 would normally detect it, but it looks like something changed with the GitHub layout a few days ago - there are now tabs on the main repo page for readme, code of conduct, and license.

This is minor enough not to need a changelog entry.

Checklist

• Did you update CHANGELOG.md with your changes?
• Does the PR clearly describe the problem and the solution?
• Have you reviewed our Contributing Guide?
• Does the PR use "Fix #XXX" notation to tell GitHub to close the relevant issue numbered XXX when the PR is merged?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a911d9c) 88.38% compared to head (4a05a13) 88.38%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1022   +/-   ##
=======================================
  Coverage   88.38%   88.38%           
=======================================
  Files          45       45           
  Lines        9565     9565           
  Branches     2720     2720           
=======================================
  Hits         8454     8454           
  Misses        784      784           
  Partials      327      327           

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