Docs: keep beta marker on Apple Silicon

Restore the "currently in beta" marker on the Apple Silicon footnote
while keeping the Rosetta 2 guidance, so the note now states both the
beta status and when Rosetta 2 is required.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: redsun82

docs/codeql/reusables/supported-platforms.rst

@@ -19,4 +19,4 @@
 .. container:: footnote-group
 
     .. [1] Support for Linux on arm64 is currently in beta.
-    .. [2] On Apple Silicon, building your code during analysis requires Rosetta 2; analyzing an interpreted language or using build mode ``none`` runs natively.
+    .. [2] Support for Apple Silicon is currently in beta. Building your code during analysis requires Rosetta 2; analyzing an interpreted language or using build mode ``none`` runs natively.