Fix comment.

src/EditorFeatures/Core/FindUsages/AbstractFindUsagesService.DefinitionTrackingContext.cs

@@ -14,7 +14,7 @@ internal abstract partial class AbstractFindUsagesService
         /// Forwards <see cref="IFindUsagesContext"/> notifications to an underlying <see cref="IFindUsagesContext"/>
         /// while also keeping track of the <see cref="DefinitionItem"/> definitions reported.
         /// 
-        /// These can then be used by <see cref="CallThirdPartyExtensionsAsync"/> to report the
+        /// These can then be used by <see cref="GetThirdPartyDefinitions"/> to report the
         /// definitions found to third parties in case they want to add any additional definitions
         /// to the results we present.
         /// </summary>