[geary/wip/726576-clarify] First stab at clarifying a couple of points in the help docs

[Jim Nelson <jnelson src gnome org>]

commit 1ed5f5d64908a1494aac5bbaeb8acb0d4ef0c550
Author: Jim Nelson <jim yorba org>
Date:   Mon Mar 17 12:49:36 2014 -0700

    First stab at clarifying a couple of points in the help docs

 help/C/accounts.page    |    7 +++++--
 help/C/archive.page     |    3 +++
 help/C/preferences.page |    6 ++++--
 3 files changed, 12 insertions(+), 4 deletions(-)
---
diff --git a/help/C/accounts.page b/help/C/accounts.page
index 3f1c942..b91230a 100644
--- a/help/C/accounts.page
+++ b/help/C/accounts.page
@@ -16,8 +16,11 @@
        select if your account is Gmail, Yahoo, Outlook.com, or other.  For other account types, you will
        need to enter your IMAP and SMTP login settings manually.</p>
        
-       <p>Additional accounts can be added from the Accounts dialog.  Click Accounts in the application
-       menu or gear menu (or press <keyseq><key>Ctrl</key><key>M</key></keyseq>) to open the Accounts
+       <p>Additional accounts can be added from the Accounts dialog.  The <gui>Accounts</gui> option is
+       available in either Geary's application menu or the gear menu in the upper-right of the
+       toolbar.  (The location depends on the install desktop shell.  For GNOME Shell and Unity, the
+       application menu is available near the top-left corner of the screen.)  Alternately,
+       <keyseq><key>Ctrl</key><key>M</key></keyseq> will open the Accounts
        dialog.  To add an account, click the + button.</p>
        </section>
        
diff --git a/help/C/archive.page b/help/C/archive.page
index ae001d6..4787e00 100644
--- a/help/C/archive.page
+++ b/help/C/archive.page
@@ -18,5 +18,8 @@
        button on the toolbar.  To permanently delete the conversations, hold down <key>Shift</key> and press
        the <gui>Delete</gui> button that appears in place of the <gui>Trash</gui> button.</p>
 
+       <p>Delete is not available from every folder, such as Search.  Delete is also unavailable for Gmail.
+       For Gmail, <gui>Trash</gui> will move messages to the Trash folder on the server, where the user can
+       then manually delete them.  The server will automatically remove trashed messages after 30 days.</p>
 </page>
 
diff --git a/help/C/preferences.page b/help/C/preferences.page
index 443530f..df48892 100644
--- a/help/C/preferences.page
+++ b/help/C/preferences.page
@@ -8,8 +8,10 @@
         <link type="next" xref="search" />
     </info>
    <title>Preferences</title>
-       <p>To set preferences in Geary, open the application menu or click the gear menu at the upper right
-       of the toolbar and choose <gui>Preferences</gui>.</p>
+       <p>The <gui>Preferences</gui> option is available in either Geary's application menu or the
+       gear menu in the upper-right of the toolbar.  (The location depends on the install desktop
+       shell.  For GNOME Shell and Unity, the application menu is available near the top-left corner of
+       the screen.)</p>
        
     <section>
        <title>Reading</title>