refactor(dev-infra): several code style and typo fixes (#39135)

This commit addresses comments from [my review][1] on PR #38656 (which
was merged without comments addressed). The changes are mostly related
to code style and typos.

[1]: https://github.com/angular/angular/pull/38656#pullrequestreview-482129333

PR Close #39135

.ng-dev/release.ts

@@ -26,7 +26,7 @@ export const release: ReleaseConfig = {
   ],
   // TODO: Implement release package building here.
   buildPackages: async () => [],
-  // TODO: This can be removed once there is a org-wide tool for changelog generation.
+  // TODO: This can be removed once there is an org-wide tool for changelog generation.
   generateReleaseNotesForHead: async () => {
     exec('yarn -s gulp changelog', {cwd: join(__dirname, '../')});
   },