Bump sphinxcontrib-devhelp from 1.0.2 to 2.0.0 in /docs

Bumps [sphinxcontrib-devhelp](https://github.com/sphinx-doc/sphinxcontrib-devhelp) from 1.0.2 to 2.0.0.
- [Release notes](https://github.com/sphinx-doc/sphinxcontrib-devhelp/releases)
- [Changelog](https://github.com/sphinx-doc/sphinxcontrib-devhelp/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinxcontrib-devhelp@1.0.2...2.0.0)

---
updated-dependencies:
- dependency-name: sphinxcontrib-devhelp
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

docs/requirements.txt

@@ -7,7 +7,7 @@ jinja2==3.1.4
 sphinx-copybutton==0.5.1
 # pin some older versions that are compatible with sphinx 4.5
 sphinxcontrib-applehelp==1.0.3
-sphinxcontrib.devhelp==1.0.2
+sphinxcontrib.devhelp==2.0.0
 sphinxcontrib-htmlhelp==2.0.0
 sphinxcontrib-serializinghtml==1.1.5
 sphinxcontrib-qthelp==1.0.3