Bump pymdown-extensions from 9.5 to 10.0 in /docs

Bumps [pymdown-extensions](https://github.com/facelessuser/pymdown-extensions) from 9.5 to 10.0.
- [Release notes](https://github.com/facelessuser/pymdown-extensions/releases)
- [Commits](https://github.com/facelessuser/pymdown-extensions/compare/9.5...10.0)

---
updated-dependencies:
- dependency-name: pymdown-extensions
  dependency-type: indirect
...

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

docs/requirements.txt

@@ -24,7 +24,7 @@ markdown==3.3.7
     #   mkdocstrings
     #   pymdown-extensions
 markdown-include==0.6.0
-    # via -r docs/requirements.in
+    # via -r requirements.in
 markupsafe==2.1.1
     # via
     #   jinja2
@@ -33,20 +33,20 @@ mergedeep==1.3.4
     # via mkdocs
 mkdocs==1.3.0
     # via
-    #   -r docs/requirements.in
+    #   -r requirements.in
     #   mkdocs-autorefs
     #   mkdocstrings
 mkdocs-autorefs==0.4.1
     # via mkdocstrings
 mkdocstrings[python]==0.19.0
     # via
-    #   -r docs/requirements.in
+    #   -r requirements.in
     #   mkdocstrings-python
 mkdocstrings-python==0.7.1
     # via mkdocstrings
 packaging==21.3
     # via mkdocs
-pymdown-extensions==9.5
+pymdown-extensions==10.0
     # via mkdocstrings
 pyparsing==3.0.9
     # via packaging
@@ -55,6 +55,7 @@ python-dateutil==2.8.2
 pyyaml==6.0
     # via
     #   mkdocs
+    #   pymdown-extensions
     #   pyyaml-env-tag
 pyyaml-env-tag==0.1
     # via mkdocs
@@ -63,4 +64,4 @@ six==1.16.0
 watchdog==2.1.9
     # via mkdocs
 zipp==3.8.0
-    # via importlib-metadata
+    # via importlib-metadata