docs: fix a comment typo (#23592)

Hi,
Just a small meaningless comment typo 🙃 

Have a great day!

Signed-off-by: Yury Michurin <yury.michurin@gmail.com>

packages/playwright-test/src/worker/fixtureRunner.ts

@@ -74,7 +74,7 @@ class Fixture {
       }
     }
 
-    // Break the regustration function into before/after steps. Create these before/after stacks
+    // Break the registration function into before/after steps. Create these before/after stacks
     // w/o scopes, and create single mutable step that will be converted into the after step.
     const shouldGenerateStep = !this.registration.hideStep && !this.registration.name.startsWith('_') && !this.registration.option;
     const isInternalFixture = this.registration.location && filterStackFile(this.registration.location.file);