Use API level more consistently.

This is all the matches for "Android\ [A-Z]\b" in bionic/.

Change-Id: I81b6fc5c96fb67e74d7c99340e074691864f865f
diff --git a/libc/platform/bionic/tls_defines.h b/libc/platform/bionic/tls_defines.h
index 06c6617..dd3563d 100644
--- a/libc/platform/bionic/tls_defines.h
+++ b/libc/platform/bionic/tls_defines.h
@@ -66,8 +66,8 @@
 //  - TLS_SLOT_BIONIC_TLS: Optimizes accesses to bionic_tls by one load versus
 //    finding it using __get_thread().
 //
-//  - TLS_SLOT_APP: Available for use by apps in Android Q and later. (This slot
-//    was used for errno in P and earlier.)
+//  - TLS_SLOT_APP: Available for use by apps in API level 29 and later.
+//    (This slot was used for errno in API level 28 and earlier.)
 //
 //  - TLS_SLOT_NATIVE_BRIDGE_GUEST_STATE: Pointer to the guest state for native
 //    bridge implementations. It is (to be) used by debuggerd to access this