Automatically port System.Runtime.Intrinsics.X86 triple slash comments (#3095)

* Automatically port System.Runtime.Intrinsics.X86

* remove BOM character

* remove BOM character

* remove BOM character

* remove BOM character

* test para tags

* Forced endline and spacing in function summaries. Moved explanations to remarks or exception, depending on each case.

* Test nbsp to force space

M:System.Runtime.Intrinsics.X86.Sse2.Add

* Testing <para> and &#160;

* Remove &#160;, leave only <para></para>

Author: carlossanlop