- Document modern way to work with vulnerability database
- Do some rewording, remove "you" and "your" where possible (special thanks to wblock)

Reviewed by:	mat, wblock
Approved by:	mat, wblock

Differential Revision:	https://reviews.freebsd.org/D941


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@45838 c2e8774f-c49f-e111-b436-862b2bbc8956