Removed .NET notes

Issues fixed in 3.6.1
Removed `contain` bug notes from 3.7 reference docs

Removed the bug notes re: `contain` problems from 3.7 reference docs lang_classes and lang_containment. The relevant issues are fixed in 3.7.
Updated information re: 64-bit Windows and file system redirection

Edited Windows and reference docs with updated information about file system redirection as changed in Puppet 3.7.

3.7/reference/lang_windows_file_paths
3.7/reference/resources_file_windows
windows/index
windows/troubleshooting