tweak 'triton create -h' output to help clarify/group related create options

lib/do_instance/do_create.js

@@ -400,6 +400,45 @@ do_create.options = [
         type: 'string',
         help: 'Instance name. If not given, one will be generated server-side.'
     },
+    {
+        names: ['tag', 't'],
+        type: 'arrayOfString',
+        helpArg: 'TAG',
+        help: 'Add a tag when creating the instance. Tags are ' +
+            'key/value pairs available on the instance API object as the ' +
+            '"tags" field. TAG is one of: a "key=value" string (bool and ' +
+            'numeric "value" are converted to that type), a JSON object ' +
+            '(if first char is "{"), or a "@FILE" to have tags be ' +
+            'loaded from FILE. This option can be used multiple times.'
+    },
+    {
+        names: ['affinity', 'a'],
+        type: 'arrayOfString',
+        helpArg: 'RULE',
+        help: 'Affinity rules for selecting a server for this instance. ' +
+            'Rules have one of the following forms: `instance==INST` (the ' +
+            'new instance must be on the same server as INST), ' +
+            '`instance!=INST` (new inst must *not* be on the same server as ' +
+            'INST), `instance==~INST` (*attempt* to place on the same server ' +
+            'as INST), or `instance!=~INST` (*attempt* to place on a server ' +
+            'other than INST\'s). `INST` is an existing instance name or ' +
+            'id. There are two shortcuts: `inst` may be used instead of ' +
+            '`instance` and `instance==INST` can be shortened to just ' +
+            '`INST`. Use this option more than once for multiple rules.',
+        completionType: 'tritonaffinityrule'
+    },
+
+    {
+        group: ''
+    },
+    {
+        names: ['network', 'N'],
+        type: 'arrayOfCommaSepString',
+        helpArg: 'NETWORK',
+        help: 'One or more comma-separated networks (ID, name or short id). ' +
+            'This option can be used multiple times.',
+        completionType: 'tritonnetwork'
+    },
     {
         // TODO: add boolNegationPrefix:'no-' when that cmdln pull is in
         names: ['firewall'],
@@ -407,6 +446,10 @@ do_create.options = [
         help: 'Enable Cloud Firewall on this instance. See ' +
             '<https://docs.joyent.com/public-cloud/network/firewall>'
     },
+
+    {
+        group: ''
+    },
     {
         names: ['metadata', 'm'],
         type: 'arrayOfString',
@@ -433,42 +476,6 @@ do_create.options = [
             'Joyent-provided images, the user-script is run at every boot ' +
             'of the instance. This is a shortcut for `-M user-script=FILE`.'
     },
-    {
-        names: ['tag', 't'],
-        type: 'arrayOfString',
-        helpArg: 'TAG',
-        help: 'Add a tag when creating the instance. Tags are ' +
-            'key/value pairs available on the instance API object as the ' +
-            '"tags" field. TAG is one of: a "key=value" string (bool and ' +
-            'numeric "value" are converted to that type), a JSON object ' +
-            '(if first char is "{"), or a "@FILE" to have tags be ' +
-            'loaded from FILE. This option can be used multiple times.'
-    },
-    {
-        names: ['network', 'N'],
-        type: 'arrayOfCommaSepString',
-        helpArg: 'NETWORK',
-        help: 'One or more comma-separated networks (ID, name or short id). ' +
-            'This option can be used multiple times.',
-        completionType: 'tritonnetwork'
-    },
-
-    {
-        names: ['affinity', 'a'],
-        type: 'arrayOfString',
-        helpArg: 'RULE',
-        help: 'Affinity rules for selecting a server for this instance. ' +
-            'Rules have one of the following forms: `instance==INST` (the ' +
-            'new instance must be on the same server as INST), ' +
-            '`instance!=INST` (new inst must *not* be on the same server as ' +
-            'INST), `instance==~INST` (*attempt* to place on the same server ' +
-            'as INST), or `instance!=~INST` (*attempt* to place on a server ' +
-            'other than INST\'s). `INST` is an existing instance name or ' +
-            'id. There are two shortcuts: `inst` may be used instead of ' +
-            '`instance` and `instance==INST` can be shortened to just ' +
-            '`INST`. Use this option more than once for multiple rules.',
-        completionType: 'tritonaffinityrule'
-    },
 
     {
         group: 'Other options'