[AMDGPU][MC][DOC] A fix for build failure in r349368

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349370 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/AMDGPUOperandSyntax.rst b/docs/AMDGPUOperandSyntax.rst
index 4fa2bb2..e415452 100644
--- a/docs/AMDGPUOperandSyntax.rst
+++ b/docs/AMDGPUOperandSyntax.rst
@@ -441,8 +441,6 @@
 
 .. WARNING:: This operand is not currently supported by AMDGPU assembler.
 
-.. _amdgpu_synid_ldsdirect:
-
 lds_direct
 ----------