arm64/gcs: Fix documentation for HWCAP

In one of the renumberings of the GCS hwcap a stray reference to HWCAP2 was
left, fix it.

Reported-by: David Spickett <[email protected]>
Fixes: 7058bf8 ("arm64/gcs: Document the ABI for Guarded Control Stacks")
Signed-off-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: broonie

Documentation/arch/arm64/gcs.rst

@@ -37,7 +37,7 @@ intended to be exhaustive.
   shadow stacks rather than GCS.
 
 * Support for GCS is reported to userspace via HWCAP_GCS in the aux vector
-  AT_HWCAP2 entry.
+  AT_HWCAP entry.
 
 * GCS is enabled per thread.  While there is support for disabling GCS
   at runtime this should be done with great care.