Drop 'to' option for link rules from manpage
The apparmor.d manpage listed 'to' as an alternative for '->' in link rules.
However, the parser doesn't accept 'to', none of our examples and tests include it, and nobody ever complained about it. Therefore I'll call this a documentation bug ;-) and simply adjust the manpage to only list '->' as valid syntax.
I propose this patch for 2.11..master