Fix manpage whatis entry

[thperret]

First, thanks a lot for this nice tool. I'm not using it often but it comes in handy when I need it.

The current manpage has a problem in the NAME entry. According to the specifications, the program name must not contain any whitespace characters.

You can check that by using the lexgrog command line (from man-db package in Debian-like distributions):

$ lexgrog pass-audit.1
pass-audit.1: parse failed

with this fix:

$ lexgrog pass-audit.1 
pass-audit.1: "pass-audit - A pass(1) extension for auditing your password repository."

Note: this comes from a lintian check

[roddhjav]

Thank for this PR. Merged.