Improve phd help

Summary: Fixes T3680. One description was wrong, and clean up some of the other stuff.

Test Plan: Ran `phd`.

Reviewers: btrahan, Korvin

Reviewed By: Korvin

CC: aran, jifriedman, Korvin

Maniphest Tasks: T3680

Differential Revision: https://secure.phabricator.com/D6683

src/applications/daemon/management/PhabricatorDaemonManagementDebugWorkflow.php

@@ -10,7 +10,11 @@ final class PhabricatorDaemonManagementDebugWorkflow
   public function didConstruct() {
     $this
       ->setName('debug')
-      ->setSynopsis(pht('Show a list of available daemons.'))
+      ->setExamples('**debug** __daemon__')
+      ->setSynopsis(
+        pht(
+          'Start __daemon__ in the foreground and print large volumes of '.
+          'diagnostic information to the console.'))
       ->setArguments(
         array(
           array(

src/applications/daemon/management/PhabricatorDaemonManagementLaunchWorkflow.php

@@ -10,7 +10,10 @@ final class PhabricatorDaemonManagementLaunchWorkflow
   public function didConstruct() {
     $this
       ->setName('launch')
-      ->setSynopsis(pht('Show a list of available daemons.'))
+      ->setExamples('**launch** [n] __daemon__ [options]')
+      ->setSynopsis(pht(
+        'Start a specific __daemon__, or __n__ copies of a specific '.
+        '__daemon__.'))
       ->setArguments(
         array(
           array(

src/applications/daemon/management/PhabricatorDaemonManagementLogWorkflow.php

@@ -6,7 +6,11 @@ final class PhabricatorDaemonManagementLogWorkflow
   public function didConstruct() {
     $this
       ->setName('log')
-      ->setSynopsis(pht('Print the log for a daemon.'))
+      ->setExamples('**log** __id__')
+      ->setSynopsis(
+        pht(
+          'Print the log for a daemon, identified by ID. You can get the '.
+          'ID for a daemon from the Daemon Console in the web interface.'))
       ->setArguments(
         array(
           array(