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/examples/voting.rst

@@ -30,7 +30,7 @@ At the end of the voting time, ``winningProposal()``
 will return the proposal with the largest number
 of votes.
 
-::
+.. code-block:: solidity
 
     // SPDX-License-Identifier: GPL-3.0
     pragma solidity >=0.7.0 <0.9.0;