Remove reference to the deprecated and disabled Typo issue

Metalava no longer looks for common typos. It relies on the code
analyzers that run on Gerrit to detect them.

Bug: 288072162
Test: TH
Change-Id: I489093568adaf15328d065a58241de4b3d9dab77

Android.bp

@@ -505,7 +505,6 @@ metalava_framework_docs_args = "" +
     "--hide RequiresPermission " +
     "--hide SdkConstant " +
     "--hide Todo " +
-    "--hide Typo " +
     "--hide UnavailableSymbol " +
     "--manifest $(location :frameworks-base-core-AndroidManifest.xml) "