Apply suggestions from code review

Co-authored-by: Jakub Piasecki <jakubpiasecki67@gmail.com>
Co-authored-by: Michał Bert <63123542+m-bert@users.noreply.github.com>

Author: 3 people

packages/docs-gesture-handler/docs/guides/testing.mdx

@@ -90,7 +90,7 @@ When a gesture object is passed directly, the event payload type is inferred fro
 the gesture. Every lifecycle method accepts an optional partial event payload and
 fills omitted handler-specific properties with defaults.
 
-The controller exposes these methods:
+The controller exposes the following methods:
 
 | Method       | Behavior                                                                                                         |
 | ------------ | ---------------------------------------------------------------------------------------------------------------- |

packages/react-native-gesture-handler/src/handlers/handlersRegistry.ts

@@ -42,7 +42,7 @@ export function unregisterGesture(handlerTag: number) {
 
   const gesture = hookGestures.get(handlerTag);
 
-  if (gesture?.config.testID) {
+  if (gesture?.config?.testID) {
     testIDs.delete(gesture.config.testID);
   }
 

packages/react-native-gesture-handler/src/jestUtils/jestUtils.ts

@@ -555,7 +555,7 @@ function validateControllerEvent(event: Record<string, unknown>) {
   for (const field of FORBIDDEN_CONTROLLER_EVENT_FIELDS) {
     invariant(
       !hasProperty(event, field),
-      `createGestureController manages '${field}' internally. Pass only gesture event payload fields.`
+      `GestureController manages '${field}' internally. Pass only gesture event payload fields.`
     );
   }
 }