Mention (all) profile in the man page

Author: Martin Preisler

utils/oscap.8

@@ -83,7 +83,7 @@ You may specify OVAL Definition files as the last parameter, XCCDF evaluation wi
 .TP
 \fB\-\-profile PROFILE\fR
 .RS
-Select a particular profile from XCCDF document.
+Select a particular profile from XCCDF document. If "(all)" is given a virtual profile that selects all groups and rules will be used.
 .RE
 .TP
 \fB\-\-rule RULE\fR