gh-146445: Update CODEOWNERS for Android and iOS migration to Platforms directory (GH-149543)

(cherry picked from commit 5b58fbc)

Co-authored-by: Malcolm Smith <smith@chaquo.com>

Author: mhsmith

.github/CODEOWNERS

@@ -156,16 +156,15 @@ Misc/libabigail.abignore      @encukou
 # ----------------------------------------------------------------------------
 
 # Android
-Android/                      @mhsmith @freakboy3742
+Platforms/Android/            @mhsmith @freakboy3742
 Doc/using/android.rst         @mhsmith @freakboy3742
 Lib/_android_support.py       @mhsmith @freakboy3742
 Lib/test/test_android.py      @mhsmith @freakboy3742
 
 # iOS
 Doc/using/ios.rst             @freakboy3742
 Lib/_ios_support.py           @freakboy3742
-Apple/                        @freakboy3742
-iOS/                          @freakboy3742
+Platforms/Apple/              @freakboy3742
 
 # macOS
 Mac/                          @python/macos-team