docs/

Enhancing all the .rst doc files by adding highlighting for the code snippets, including the following langs:
1. Solidity

2. bash

3. javascript

4. assembly

docs/contracts/function-modifiers.rst

@@ -15,7 +15,7 @@ inheritable properties of contracts and may be overridden by derived contracts,
 if they are marked ``virtual``. For details, please see
 :ref:`Modifier Overriding <modifier-overriding>`.
 
-::
+.. code-block:: solidity
 
     // SPDX-License-Identifier: GPL-3.0
     pragma solidity >0.7.0 <0.9.0;