[documentation] [Documentation task] Write some proper Block visibility setting snippets

[Heine]

Issue status update for 
http://drupal.org/node/60291
Post a follow up: 
http://drupal.org/project/comments/add/60291

 Project:      Documentation
 Version:      <none>
 Component:    Admin Guide
 Category:     tasks
 Priority:     normal
 Assigned to:  Heine
 Reported by:  Heine
 Updated by:   Heine
 Status:       active

Write some proper Block visibility setting snippets for
http://drupal.org/node/57779




Heine