Sphinx: fix 'Inline emphasis start-string without end-string'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_60@326184 91177308-0d34-0410-b5e6-96231b3b80d8

Author: zmodem

docs/ReleaseNotes.rst

@@ -204,7 +204,7 @@ During this release the X86 target has:
 
 * Gained initial support recognizing variable shuffles from vector element extracts and inserts.
 
-* Improved documentation for SSE/AVX intrinsics in *intrin.h header files.
+* Improved documentation for SSE/AVX intrinsics in intrin.h header files.
 
 Changes to the AMDGPU Target
 -----------------------------