Fix MemTagSanitizer docs to point at Armv8.5-A MTE

The Memory Tagging Extension was introduced in Armv8.5-A.
llvm · Mar 5, 2020 · e440e0a · e440e0a
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diff --git a/llvm/docs/MemTagSanitizer.rst b/llvm/docs/MemTagSanitizer.rst
@@ -13,7 +13,7 @@ functionality is planned but not implemented.  Hardware capable of
 running MemTagSanitizer does not exist as of Oct 2019.
 
 MemTagSanitizer is a fast memory error detector and **a code hardening
-tool** based on ARMv9 `Memory Tagging Extension`_. It
+tool** based on the Armv8.5-A `Memory Tagging Extension`_. It
 detects a similar class of errors as `AddressSanitizer`_ or `HardwareAssistedAddressSanitizer`_, but with
 **much** lower overhead.
 

diff --git a/llvm/docs/Reference.rst b/llvm/docs/Reference.rst
@@ -190,7 +190,7 @@ Additional Topics
 
 :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