Fix documentation for is_X_feature_detected!

Amanieu · Amanieu · commit 2b3fa0699422 · 2022-02-17T18:17:15.000Z
These are now properly documented for all architectures and the
stability attributes in the docs are now correctly displayed.
diff --git a/library/stdarch b/library/stdarch
@@ -1 +1 @@
-Subproject commit 863d31b8e1314e15d124384e5eaa9ab21e12bd79
+Subproject commit b4a0e07552cf90ef8f1a5b775bf70e4db94b3d63
