[mdoc] Refreshed the en.expected.importecmadoc files to fix errors after the recent XML changes

The XML work in 661430fd1f052c5589bcd5d116f37b9ee4e27210 and bf39f5aec034800abcfe5e73a63ddd1414cb8078 changed the whitespace handling, so the mdoc test suite failed.
Refreshing the files makes them identical to what MS.NET produces and fixes the mdoc tests.
Merge pull request #1393 from akoeplinger/refresh-mdoc-expected

[mdoc] Refreshed the en.expected.importecmadoc files to fix errors after the recent XML changes

Output was generated on .NET, and thus is canonical.
[jit] Use xmm5 as an fp scratch register on winx64.