doc: adding guide on default highlighting

Signed-off-by: James Knight <[email protected]>

Author: jdknight

doc/guide-highlight-default.rst

@@ -0,0 +1,16 @@
+Configuring the default highlighter
+===================================
+
+Sphinx's default highlight language is ``python``. For any documentation
+processed by this extension that does not have an explicit language type
+provided will fallback to Sphinx's default.
+
+Users wishing to override the default highlight language can use the
+:lref:`confluence_lang_overrides` configuration. For example, adding the
+following option inside a project's ``conf.py`` file:
+
+.. code-block:: python
+
+    confluence_lang_overrides = {
+        'default': 'none',
+    }

doc/guides.rst

@@ -10,6 +10,7 @@ the Confluence Builder extension in a Sphinx-enabled environment.
     guide-class-hints
     guide-collapse
     guide-confluence-macros
+    guide-highlight-default
     guide-math
     guide-strike
     guide-ci