[PATCH v2 RESEND] Documentation/protection-keys: Mark as available on AMD

[Daniel Tang <danielzgtg.opensource@gmail.com>]

This is shown on page 78 of AMD document 55898 "Preliminary Processor
Programming Reference (PPR) for AMD Family 19h Model 01h, Revision B1
Processors Volume 1 of 2" for Zen 3.

I tested this on my 5900X via the program in pkeys(7) and
`grep ospke /proc/cpuinfo`.

Signed-off-by: Daniel Tang <danielzgtg.opensource@gmail.com>
---
 Documentation/core-api/protection-keys.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/core-api/protection-keys.rst b/Documentation/core-api/protection-keys.rst
index 7eb7c6023e09..59e7c178af4b 100644
--- a/Documentation/core-api/protection-keys.rst
+++ b/Documentation/core-api/protection-keys.rst
@@ -11,7 +11,7 @@ application changes protection domains.
 Pkeys Userspace (PKU) is a feature which can be found on:
         * Intel server CPUs, Skylake and later
         * Intel client CPUs, Tiger Lake (11th Gen Core) and later
-        * Future AMD CPUs
+        * AMD Zen 3 and later
         * arm64 CPUs implementing the Permission Overlay Extension (FEAT_S1POE)
 
 x86_64
-- 
2.51.0