gopls/internal/lsp/source: GopSignatureHelp skip hover doc for overload object

Author: visualfc

Diff for: gopls/internal/goxls/testdata/overload/signature2.gop.in

@@ -0,0 +1,3 @@
+func _() {
+	Demo //@signature_overload(" //", "Demo__1(n int) int", 1, 0)
+}

Diff for: gopls/internal/goxls/testdata/overload/signature3.gop.in

@@ -0,0 +1,3 @@
+func _() {
+	Demo 100,//@signature_overload("//", "Demo__2(n1 int, n2 int)", 2, 1)
+}

Diff for: gopls/internal/lsp/source/signature_help_gox.go

@@ -146,12 +146,14 @@ FindCall:
 		comment *ast.CommentGroup
 	)
 	if obj != nil {
-		d, err := HoverDocForObject(ctx, snapshot, pkg.FileSet(), obj)
-		if err != nil && !overloads {
-			return nil, 0, 0, err
-		}
 		name = obj.Name()
-		comment = d
+		if !overloads {
+			d, err := HoverDocForObject(ctx, snapshot, pkg.FileSet(), obj)
+			if err != nil {
+				return nil, 0, 0, err
+			}
+			comment = d
+		}
 	} else {
 		name = "func"
 	}