Merge pull request #83455 from Lunarisnia/fix/gdscript-error-typo

Fix grammar typo in GDScript error message

modules/gdscript/gdscript_analyzer.cpp

@@ -4343,7 +4343,7 @@ void GDScriptAnalyzer::reduce_subscript(GDScriptParser::SubscriptNode *p_subscri
 					}
 				} else if (base_type.kind != GDScriptParser::DataType::BUILTIN && !index_type.is_variant()) {
 					if (index_type.builtin_type != Variant::STRING && index_type.builtin_type != Variant::STRING_NAME) {
-						push_error(vformat(R"(Only String or StringName can be used as index for type "%s", but received a "%s".)", base_type.to_string(), index_type.to_string()), p_subscript->index);
+						push_error(vformat(R"(Only "String" or "StringName" can be used as index for type "%s", but received "%s".)", base_type.to_string(), index_type.to_string()), p_subscript->index);
 					}
 				}