[Fix] code review.

Author: link-xyq

llvm/docs/RISCVUsage.rst

@@ -532,7 +532,8 @@ The current vendor extensions supported are:
   LLVM implements `version 5.0.0 of the Andes Vector Dot Product Extension specification <https://github.com/andestech/andes-v5-isa/releases/download/ast-v5_4_0-release/AndeStar_V5_ISA_Spec_UM165-v1.5.08-20250317.pdf>`__ by Andes Technology. All instructions are prefixed with `nds.` as described in the specification.
 
 ``XSMTVDot``
-  LLVM implements `version 1.0.0 of the SpacemiT Vector Dot Product Extension specification <https://developer.spacemit.com/documentation?token=BWbGwbx7liGW21kq9lucSA6Vnpb#2.1>`__ by SpacemiT. All instructions are prefixed with `smt.` as described in the specification.
+  SpacemiT defines `Intrinsic Matrix Extension (IME) specification <https://github.com/space-mit/riscv-ime-extension-spec/releases/tag/v0429>`__.
+  LLVM implement the hardware-adapted subset for SpacemiT X60, documented at: `<https://developer.spacemit.com/documentation?token=BWbGwbx7liGW21kq9lucSA6Vnpb#2.1>`__by SpacemiT. All instructions are prefixed with `smt.` as described in the implementation guide. Note that this implemented subset is `version 1.0.0 of the SpacemiT Vector Dot Product Extension specification`__, which is strictly a subset of the full IME specification to reflect the capabilities of SpacemiT X60 hardware correctly.
 
 Experimental C Intrinsics
 =========================