Polishing --> code-block directive ini #4

Co-authored-by: Hong Xu <[email protected]>

index.rst

@@ -308,7 +308,9 @@ a single tab with width equal to 4, or two tabs with width equal to 2.
 
 This is when ``indent_style`` comes into picture. It specifies what character should be used **whenever possible** in order to
 achieve the indentation size specified in ``indent_size``. To fully understand what "whenever possible" actually means, lets
-assume that the editorconfig rules are specified for the file above::
+assume that the editorconfig rules are specified for the file above:
+
+.. code-block:: ini
 
     root = true
     [example_file.py]