Add language to fenced code blocks for highlighting

    Tim

Signed-off-by: Tim_Tech_Dev <[email protected]>

Author: TimTechDev

docs/contribute/contribute.md

@@ -46,7 +46,7 @@ pressing <kbd>Ctrl</kbd> + <kbd>P</kbd> and then <kbd>!</kbd> (or
 
 You can also use you terminal to build nodecg-io:
 
-```
+```shell
 cd path/to/nodecg-io
 npm run build
 ```
@@ -56,7 +56,7 @@ To do a full rebuild instead of just an incremental build you can use
 
 The watch builder can be activated here too:
 
-```
+```shell
 cd path/to/nodecg-io
 npm run watch
 ```
@@ -86,7 +86,7 @@ start a Pull Request.
 Occasionally you will want to merge changes in the upstream repository (the
 official code repo) with your fork.
 
-```
+```shell
 cd path/to/nodecg-io
 git checkout master
 git pull https://github.com/codeoverflow-org/nodecg-io master

docs/samples/intellij.md

@@ -30,7 +30,7 @@ will also tell you how to log in and how to use the GUI.
 1. In NodeCG, create a new IntelliJ service instance.
 2. Enter the host and port of your IDE's HTTP server:
 
-    ```
+    ```json
     {
         "address": "127.0.0.1:19524"
     }