Add DNA and correct macOS for format title (#4848)

* add more ignore pattern for git

* revert the change for api/.gitignore

* Add DNA and change MacOS to macOS to align with Apple official name

* Move DNA to acronyms

Co-authored-by: Jian Liao <jianliao@adobe.com>

packages/format-title/src/acronyms.ts

@@ -19,6 +19,7 @@ export default [
 	'DIY',
 	'DVD',
 	'DB',
+	'DNA',
 	'E3',
 	'EIN',
 	'ESPN',

packages/format-title/src/special-case.ts

@@ -12,7 +12,7 @@ export default [
 	'iPad',
 	'iPhone',
 	'iPod',
-	'MacOS',
+	'macOS',
 	'M2M',
 	'M2O',
 	'McDonalds',