pf.conf.5: Don't use greater-equal/less-equal symbols where "<="/">=" are intended.

Also, clean up some usage of predefined strings (which are discouraged by
mandoc_char(7) for portability reasons) and improve spacing in
hostapd.conf(5).

ok schwarze@

Obtained from: OpenBSD, bentley <bentley@openbsd.org>, e369c2e695
Sponsored by: Rubicon Communications, LLC ("Netgate")