Update the TinyMCE paste plugin to the latest development version. It includes a fix for pasting from Word: removes inline comments and change tracking.
Changeset: https://github.com/tinymce/tinymce/commit/f8cffdf34287afaa54ffbf7d6b0eb7b22a8c27ac
Fixes #27771

git-svn-id: https://develop.svn.wordpress.org/trunk@28089 602fd350-edb4-49c9-b593-d223f7449a82