Security access_control reword

Hi guys!

This rewords security sections to be even more clear that secure_channel and ip don't actually restrict access (the first redirects, the latter determines access_control matching, which when used cleverly like in the example, *could* restrict access).

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | no
| Applies to    | all
| Fixed tickets | n/a

Thanks!