chore: PVP line endings, trailing whitespace, and an XmlDoc see tag

NetworkTransform.cs and NativeInterpolator.cs picked up CRLF when the
interpolation render time up-port was merged. A merge writes the result
straight into the index, so the .gitattributes eol=lf normalization that
runs on add never got a chance at them.

- PVP-121-2: both files back to LF.
- PVP-124-2: the three lines with trailing whitespace.
- PVP-150-1: TransformSyncModes used <see></see> rather than <see/>.

Author: NoelStephensUnity