dev_guide: Add Pygments Lexer examples (ansible#71458)

* dev_guide: Add Pygments Lexer examples

Fixes: ansible#51307

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

* adds ansible-output lexer, remmoves unsupported lexers

Co-authored-by: Alicia Cozine <acozine@users.noreply.github.com>

docs/docsite/rst/dev_guide/style_guide/index.rst

@@ -133,6 +133,40 @@ We use:
       """"""""""""""""""""""""""""
 
 
+Syntax highlighting - Pygments
+------------------------------
+
+The Ansible documentation supports a range of `Pygments lexers <http://pygments.org/>`_
+for `syntax highlighting <https://www.sphinx-doc.org/en/master/usage/restructuredtext/directives.html#code-examples>`_ to make our code examples look good. Each code-block must be correctly indented and surrounded by blank lines.
+
+The Ansible documentation allows the following values:
+
+* none (no highlighting)
+* ansible-output (a custom lexer for Ansible output)
+* bash
+* console
+* csharp
+* ini
+* json
+* powershell
+* python
+* rst
+* sh
+* shell
+* shell-session
+* text
+* yaml
+* yaml+jinja
+
+For example, you can highlight Python code using following syntax:
+
+.. code-block:: rst
+
+      .. code-block:: python
+
+         def my_beautiful_python_code():
+            pass
+
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