Update example-language-server.md to correct typo

"implemented in *ther* native programming languages" -> "implemented in *their* native programming languages"

docs/extensions/example-language-server.md

@@ -16,7 +16,7 @@ Language Server is a special kind of extension that powers the editing experienc
 
 However, while implementing support for language features in VS Code, we found three common problems:
 
-First, Language Servers are usually implemented in ther native programming languages, and that presents a challenge in integrating them with VS Code which has a Node.js runtime.
+First, Language Servers are usually implemented in their native programming languages, and that presents a challenge in integrating them with VS Code which has a Node.js runtime.
 
 Additionally, language features can be resource intensive. For example, to correctly validate a file, Language Server needs to parse a large amount of files, build up Abstract Syntax Trees for them and perform static program analysis. Those operations could incur significant CPU and memory usage and we need to ensure that VS Code's performance remains unaffected.