refactor(animations): fix typo in transition animations spec file (#42763)

fix the typo "mean't" in the transition_animation_engine spec file
to "meant" (the typo is simply in a code comment so the change
does not have any impact)

PR Close #42763

packages/animations/browser/test/render/transition_animation_engine_spec.ts

@@ -20,7 +20,7 @@ const DEFAULT_NAMESPACE_ID = 'id';
 (function() {
 const driver = new MockAnimationDriver();
 
-// these tests are only mean't to be run within the DOM
+// these tests are only meant to be run within the DOM
 if (isNode) return;
 
 describe('TransitionAnimationEngine', () => {