Merge pull request #4251 from AndreasVolkmann/patch-2

Update walkthrough-highlighting-text.md

Author: Jak-MS

docs/extensibility/walkthrough-highlighting-text.md

@@ -280,7 +280,7 @@ You can add different visual effects to the editor by creating Managed Extensibi
 
 7. The `SynchronousUpdate` performs a synchronous update on the `WordSpans` and `CurrentWord` properties, and raises the `TagsChanged` event.
 
-    ```vb
+    ```csharp
     void SynchronousUpdate(SnapshotPoint currentRequest, NormalizedSnapshotSpanCollection newSpans, SnapshotSpan? newCurrentWord)
     {
         lock (updateLock)
@@ -400,4 +400,4 @@ You can add different visual effects to the editor by creating Managed Extensibi
 4. Position the cursor in one of the occurrences of "hello". Every occurrence should be highlighted in blue.
 
 ## See also
-- [Walkthrough: Link a content type to a file name extension](../extensibility/walkthrough-linking-a-content-type-to-a-file-name-extension.md)
+- [Walkthrough: Link a content type to a file name extension](../extensibility/walkthrough-linking-a-content-type-to-a-file-name-extension.md)