plugins: clean up plugin descriptions

- Make plugin descriptions more consistent
  so the output of "show plugin" can be
  used in the wiki.

Change-Id: I4c6feb11e7dcc5a4cf0848eed37f1d3b035c7dda
Signed-off-by: Dave Wallace <dwallacelf@gmail.com>
diff --git a/src/plugins/nat/nat.c b/src/plugins/nat/nat.c
index 249df38..0d909ce 100755
--- a/src/plugins/nat/nat.c
+++ b/src/plugins/nat/nat.c
@@ -171,7 +171,7 @@
 
 VLIB_PLUGIN_REGISTER () = {
     .version = VPP_BUILD_VER,
-    .description = "Network Address Translation",
+    .description = "Network Address Translation (NAT)",
 };
 /* *INDENT-ON* */