BUF: fix typos in Object Classes and Permissions

[dahchanson]

Fix a few minor issues

• remove extra reference to unique permissions for *_file classes
• fix emphasis in *_file classes to exclude write
• spacing in icmp_socket

Signed-off-by: Chad Hanson dahchanson@gmail.com

[pcmoore]

Sorry for the delay, but I just merged this PR at HEAD 6f5f20ed8e9f53b2534a010f7517fc4763a39004, thanks @dahchanson!