usage.dox: fix doxygen warnings in 1.8.x
authorJames Zern <jzern@google.com>
Sat, 14 Mar 2015 01:49:03 +0000 (18:49 -0700)
committerJames Zern <jzern@google.com>
Sat, 14 Mar 2015 01:49:03 +0000 (18:49 -0700)
commit6809ecc820a44cf4b3e4c13c78c03017788b8e34
tree41c8dde3c3b6ad5742691dddcf9a7c0b7768f461
parent0e6459caface5793f47f05af93cf63174a07e58b
usage.dox: fix doxygen warnings in 1.8.x

use \li to denote list items with \if.

fixes the following likely visible in <1.8.3:
usage.dox: warning: Invalid list item found
usage.dox: warning: End of list marker found without any preceding list items

Change-Id: I33c72799edf9f8866596ac8f79247050b8c75681
usage.dox