man: improvements to language for curvetun.8

Signed-off-by: Stephen Wadeley <swadeley@redhat.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
man: improvements to curvetun.8, inconsistent use of `` and '' marks.

Signed-off-by: Stephen Wadeley <swadeley@redhat.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
man: improvements to language for flowtop.8

Signed-off-by: Stephen Wadeley <swadeley@redhat.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
man: curvetun.8: minor: fix typo adress

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>