i/c/net.h: whitespace cleanup, reformatting, no changes
i/c/net.h: whitespace cleanup, reformatting, no changes

Just some cleanup like whitespace, punctiation marking and indentation
issues.

authmillenon/libcoap,gebart/libcoap,authmillenon/libcoap,gebart/libcoap,gebart/libcoap,authmillenon/libcoap