minor command help tweaks

lib/common.js

@@ -406,7 +406,7 @@ function getCliTableOptions(opts) {
     };
     if (opts.sortDefault) {
         o.default = opts.sortDefault;
-        o.help = format('%s Default is "%s"."', o.help, opts.sortDefault);
+        o.help = format('%s Default is "%s".', o.help, opts.sortDefault);
     }
     tOpts.push(o);
 

lib/do_create_instance.js

@@ -203,10 +203,10 @@ do_create_instance.options = [
     //    type: 'arrayOfCommaSepString',
     //    help: 'One or more (comma-separated) networks IDs.'
     //},
-    // XXX locality: near, far
-    // XXX metadata, metadata-file
     // XXX script (user-script)
     // XXX tag
+    // XXX locality: near, far
+    // XXX metadata, metadata-file
     {
         group: 'Other options'
     },

lib/do_datacenters.js

@@ -76,7 +76,9 @@ do_datacenters.options = [
 }));
 
 do_datacenters.help = (
-    'Show datacenters information\n'
+    'Show datacenters in this cloud.\n'
+    + 'A "cloud" is a set of related datacenters that share account\n'
+    + 'information.\n'
     + '\n'
     + 'Usage:\n'
     + '     {{name}} datacenters\n'

lib/do_keys.js

@@ -52,7 +52,7 @@ do_keys.options = [
     }
 ];
 do_keys.help = (
-    'Show public keys.\n'
+    'Show account keys.\n'
     + '\n'
     + 'Usage:\n'
     + '     {{name}} keys\n'