Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -45,18 +45,18 @@ $ git checkout -b [name_of_your_new_branch]
 
 4. Before you push your changes, make sure your code follows the `PSR12` coding standards , which is the standard Appwrite follows currently.
    You can easily do this by running the formatter
-```
+```php
 ./vendor/bin/phpcbf --standard=PSR12  <your file path>
 ```
 This will format the code according to the `PSR12` coding standard.
 
 Now, go a step further by running the linter by the following command to manually fix the issues the formatter wasn't able to fix
-```
+```php
 ./vendor/bin/phpcs --standard=PSR12 <your file path>
 ```
 This will give you a list of errors for you to rectify , if there is an instance you need more information on the errors being displayed you can pass in additional command line arguments. More list of available arguments can be found [here](https://github.com/squizlabs/PHP_CodeSniffer/wiki/Usage). A very useful command line argument is `--report=diff`. This will give you the expected changes by the linter for easy fixing of formatting issues
 
-```
+```php
 ./vendor/bin/phpcs --standard=PSR12 --report=diff <your file path>
 ```
 
@@ -66,7 +66,7 @@ $ git push origin [name_of_your_new_branch]
 ```
 6. Submit your changes for review    
 If you go to your repository on GitHub, you'll see a `Compare & pull request` button. Click on that button.  
-7. Start a Pull Request     
+7. Start a Pull Request
 Now submit the pull request and click on `Create pull request`.  
 8. Get a code review approval/reject  
 9. After approval, merge your PR