fix build error

Author: gewarren

xml/System.Diagnostics/OverflowAction.xml

@@ -50,7 +50,7 @@
 The following example enumerates the event logs defined on the local computer and displays configuration details for each event log.
 
  :::code language="csharp" source="~/snippets/csharp/System.Diagnostics/EventLog/GetEventLogs/source1.cs" id="Snippet2":::
- :::code language="vb" source="~/snippets/visualbasic/System.Diagnostics/EventLog/GetEventLogs/source.vb" id="Snippet2":::
+ :::code language="vb" source="~/snippets/visualbasic/System.Diagnostics/EventLog/GetEventLogs/source1.vb" id="Snippet2":::
 
  ]]></format>
     </remarks>