Mark isLocationLinkFixed as internal

src/vs/editor/common/modes.ts

@@ -739,6 +739,9 @@ export interface LocationLink {
 	targetSelectionRange?: IRange;
 }
 
+/**
+ * @internal
+ */
 export function isLocationLink(thing: any): thing is LocationLink {
 	return thing
 		&& URI.isUri((thing as LocationLink).uri)

src/vs/monaco.d.ts

@@ -5038,8 +5038,6 @@ declare namespace monaco.languages {
 		targetSelectionRange?: IRange;
 	}
 
-	export function isLocationLink(thing: any): thing is LocationLink;
-
 	export type Definition = Location | Location[] | LocationLink[];
 
 	/**