📚 DOCS: Fix docstring (#99)

Author: tsutsu3

markdown_it/main.py

@@ -133,11 +133,10 @@ def enable(
         containing rules with given names. If rule not found, and `ignoreInvalid`
         not set - throws exception.
 
-        ##### Example
+        Example::
+
+            md = MarkdownIt().enable(['sub', 'sup']).disable('smartquotes')
 
-        ```python
-        md = MarkdownIt()..enable(['sub', 'sup']).disable('smartquotes')
-        ```
         """
         result = []