style(docs-infra): fix docs examples for tslint rule semicolon (#38143)

This commit updates the docs examples to be compatible with the
`semicolon` tslint rule.

This is in preparation of updating the docs examples `tslint.json` to
match the one generated for new Angular CLI apps in a future commit.

PR Close #38143

aio/content/examples/toh-pt4/e2e/src/app.e2e-spec.ts

@@ -124,7 +124,7 @@ function expectHeading(hLevel: number, expectedText: string): void {
     let hTag = `h${hLevel}`;
     let hText = element(by.css(hTag)).getText();
     expect(hText).toEqual(expectedText, hTag);
-};
+}
 
 function getPageElts() {
   return {