docs(aot-cookbook): copy edits applying guidelines, update TOCs (#3416)

Author: kapunahelewong

public/docs/ts/latest/cookbook/_data.json

@@ -7,7 +7,7 @@
 
   "aot-compiler": {
     "title": "Ahead-of-Time Compilation",
-    "intro": "Learn how to use Ahead-of-time compilation."
+    "intro": "Learn how to use ahead-of-time compilation."
   },
 
   "ajs-quick-reference": {