tweak text of warning

src/compiler/compile/Component.ts

@@ -1310,7 +1310,7 @@ function process_component_options(component: Component, nodes) {
 						if (tag && !component.compile_options.customElement) {
 							component.warn(attribute, {
 								code: 'missing-custom-element-compile-options',
-								message: `tag name is used when compiling the compenent as a custom element. Did you forgot to add "customElement" for compile options?`
+								message: `The 'tag' option is used when generating a custom element. Did you forget the 'customElement: true' compile option?`
 							});
 						}
 

test/validator/samples/missing-custom-element-compile-options/warnings.json

@@ -6,7 +6,7 @@
 			"column": 36,
 			"line": 1
 		},
-		"message": "tag name is used when compiling the compenent as a custom element. Did you forgot to add \"customElement\" for compile options?",
+		"message": "The 'tag' option is used when generating a custom element. Did you forget the 'customElement: true' compile option?",
 		"pos": 16,
 		"start": {
 			"character": 16,