- Remove mention of MAP_INHERIT.  It hasn't been implemented for thirteen
  years.
- Remove mention of unimplemented MAP_SWAP.  There are no future plans to
  implement it.

Submitted by:	alc (2)


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271722 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f