[llvm][doc] Add Aarch64 to list of architectures supporting statepoints

Fixes https://github.com/llvm/llvm-project/issues/53655

Differential Revision: https://reviews.llvm.org/D119659
diff --git a/llvm/docs/Statepoints.rst b/llvm/docs/Statepoints.rst
index ff8cdd6..4c01731 100644
--- a/llvm/docs/Statepoints.rst
+++ b/llvm/docs/Statepoints.rst
@@ -739,7 +739,7 @@
 =======================
 
 Support for statepoint generation requires some code for each backend.
-Today, only X86_64 is supported.
+Today, only Aarch64 and X86_64 are supported.
 
 .. _OpenWork: