feat(language-service): Show documentation on hover (#34506)

This commit adds dpcumentation to the hover tooltip.

PR closes https://github.com/angular/vscode-ng-language-service/issues/321

PR Close #34506

packages/language-service/src/locate_symbol.ts

@@ -214,6 +214,8 @@ class OverrideKindSymbol implements Symbol {
 
   get definition(): Definition { return this.sym.definition; }
 
+  get documentation(): ts.SymbolDisplayPart[] { return this.sym.documentation; }
+
   members() { return this.sym.members(); }
 
   signatures() { return this.sym.signatures(); }