Improve Release Notes

Author: Stylie777

llvm/docs/ReleaseNotes.md

@@ -86,8 +86,8 @@ Changes to the AMDGPU Backend
 Changes to the ARM Backend
 --------------------------
 * The `+nosimd` attribute is now fully supported. Previously, this had no effect when being used with
-AArch32 targets, however will now disable NEON instructions being generated. The `simd` is also now
-printed when the `--print-supported-extensions` option is used..
+AArch32 targets, however this will now disable NEON instructions being generated. The `simd` option is 
+also now printed when the `--print-supported-extensions` option is used.
 
 Changes to the AVR Backend
 --------------------------