Revise markdown code block standards

Updated language code and indentation standards for markdown code blocks.

Author: guardrex

.github/copilot-instructions.md

@@ -134,16 +134,16 @@ When creating a PR for an issue:
 - Use the latest preview C# coding patterns in preview code examples
 - Use the following language code and indentation standards for markdown code blocks or the `language` attribute of code snippets:
 
-Content of the snippet | Language code | Indentation in spaces
-:---: | :---: | :---:
-C# | csharp | 4
-HTML | html | 4
-CSS | css | 4
-JavaScript | javascript | 2 spaces (use 4 spaces for line continuation)
-XML | xml | 2
-JSON | json | 2
-Console | console | 2
-Text | - | 2
+  Content of the snippet | Language code | Indentation in spaces
+  :---: | :---: | :---:
+  C# | csharp | 4
+  HTML | html | 4
+  CSS | css | 4
+  JavaScript | javascript | 2 spaces (use 4 spaces for line continuation)
+  XML | xml | 2
+  JSON | json | 2
+  Console | console | 2
+  Text | - | 2
 
 ### ASP.NET Core Specific Guidelines
 - Use the latest supported version for examples unless otherwise specified