Gordon Bergling 6d34415f67 environ(7): Update the description and include some more environment variables
- Add a better introduction to the DESCRIPTION section
- Add a description for MANPATH and POSIXLY_CORRECT
- Asorted improvements for the usage of some macros

PR:		43823
Submitted by:	Lyndon Nerenberg <lyndon at orthanc dot ab dot ca>
Reviewed by:	0mp, bcr
Approved by:	0mp, bcr
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D25912
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