Fix indent

Author: changeworld

docs/extensibility/debugger/reference/debug-custom-viewer.md

@@ -20,23 +20,23 @@ A structure that identifies a custom viewer or type visualizer.
 
 ```cpp
 typedef struct tagDEBUG_CUSTOM_VIEWER {
-   DWORD dwID;
-   BSTR  bstrMenuName;
-   BSTR  bstrDescription;
-   GUID  guidLang;
-   GUID  guidVendor;
-   BSTR  bstrMetric;
+    DWORD dwID;
+    BSTR  bstrMenuName;
+    BSTR  bstrDescription;
+    GUID  guidLang;
+    GUID  guidVendor;
+    BSTR  bstrMetric;
 } DEBUG_CUSTOM_VIEWER;
 ```
 
 ```csharp
 public struct DEBUG_CUSTOM_VIEWER {
-   public uint   dwID;
-   public string bstrMenuName;
-   public string bstrDescription;
-   public Guid   guidLang;
-   public Guid   guidVendor;
-   public string bstrMetric;
+    public uint   dwID;
+    public string bstrMenuName;
+    public string bstrDescription;
+    public Guid   guidLang;
+    public Guid   guidVendor;
+    public string bstrMetric;
 };
 ```