MFC: r231871

MFC: r231871

Switch the license boilerplates to our standard one.

Advantages:
- Reduces the number of different license versions in the tree
- Eliminates a typo
- Removes some incorrect author attributions due to c/p
- Removes c/p error potential for future pmc manpages

Approved by:	jkoshy, gnn, rpaulo, fabient (copyright holders)

git-svn-id: svn://svn.freebsd.org/base/stable/9@232151 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f