Merge pull request #2126 from thescarletmark/fix_corax_documentation

adds missing comma

Author: ppekrol

docs/indexes/search-engine/corax.mdx

@@ -78,7 +78,7 @@ E.g. -
 <TabItem value="csharp" label="csharp">
 <CodeBlock language="csharp">
 {`\{
-    "Indexing.Auto.SearchEngineType": "Corax"
+    "Indexing.Auto.SearchEngineType": "Corax",
     "Indexing.Static.SearchEngineType": "Corax"
 \}
 `}