fix(mkdocs): Correct watch path config in mkdocs

This commit fixes the configuration of the watch path in mkdocs. The
'watch' configuration previously supported by mkdocstrings is now
integrated into mkdocs. The directory referencing has been fixed by
using underscores instead of hyphens. This change will ensure the
compatibility of mkdocs with the mkdocstrings plugin.

Fixes netbox-community#21

{{cookiecutter.hyphenated}}/mkdocs.yml

@@ -47,9 +47,8 @@ plugins:
   - include-markdown
   - search:
       lang: en
-  - mkdocstrings:
-      watch:
-        - {{ cookiecutter.hyphenated }}
+watch:
+  - {{ cookiecutter.underscored }}
 extra:
   social:
     - icon: fontawesome/brands/twitter