Fix MemTagSanitizer docs to point at Armv8.5-A MTE
The Memory Tagging Extension was introduced in Armv8.5-A.
diff --git a/llvm/docs/Reference.rst b/llvm/docs/Reference.rst
index 8aef4ee..9d747b8 100644
--- a/llvm/docs/Reference.rst
+++ b/llvm/docs/Reference.rst
@@ -190,7 +190,7 @@
:doc:`MemTagSanitizer`
Security hardening for production code aiming to mitigate memory
- related vulnerabilities. Based on ARMv9 Memory Tagging Extension.
+ related vulnerabilities. Based on the Armv8.5-A Memory Tagging Extension.
:doc:`Dependence Graphs <DependenceGraphs/index>`
A description of the design of the various dependence graphs such as