Escape minus signs in lttng-ust-cyg-profile manpage

Escape minus signs in lttng-ust-cyg-profile manpage

By default, "-" chars are interpreted as hyphens (U+2010) by groff, not
as minus signs (U+002D). Since options to programs use minus signs
(U+002D), this means for example in UTF-8 locales that you cannot cut
and paste options, nor search for them easily.

Source: http://lintian.debian.org/tags/hyphen-used-as-minus-sign.html

Signed-off-by: Jon Bernard <jbernard@tuxion.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>