Minor fixes in Getting Help

One menu entry and two typos

help/C/Help_ch_GettingHelp.xml

@@ -67,8 +67,10 @@
       <listitem><para>pressing the <keycap>F1</keycap> key or</para></listitem>
       <listitem><para>selecting from the menu
         <menuchoice><guimenu><accel>H</accel>elp</guimenu><guimenuitem><accel>C</accel>ontents</guimenuitem></menuchoice>.</para></listitem>
-      <listitem><para><menuchoice><guimenu><accel>H</accel>elp</guimenu><guimenuitem>Tutorial and Concepts Guide</guimenuitem></menuchoice>
-        will open the other part of this documentation.</para></listitem>
+      <listitem><para><menuchoice><shortcut><keycombo action='simul'><keycap>Ctrl</keycap><keycap>H</keycap></keycombo></shortcut>
+        <guimenu><accel>H</accel>elp</guimenu><guimenuitem>Tutorial and Concepts Guide</guimenuitem></menuchoice>
+        will open the other part of this documentation.</para>
+      </listitem>
       <listitem><para>In most dialogs the <guibutton><accel>H</accel>elp</guibutton> button will lead you directly to the page which decribes that dialog.</para></listitem>
     </itemizedlist></para>
     <para>The complete help menu is explained in <xref linkend="AccTree-help-menu"></xref>.</para>
@@ -106,7 +108,7 @@
      <title><application>&app;</application> Wiki</title>
      <!-- Translators: if wiki pages in your language exist, add or replace the links in this section
           see also https://wiki.gnucash.org/wiki/Special:Categories for your language or region code -->
-     <para>An immense amount of less-formal, but often <emphasis>more recent</emphasis> documenation, both of
+     <para>An immense amount of less-formal, but often <emphasis>more recent</emphasis> documentation, both of
      <application>&app;</application> itself and its maintenance and
      development may be found in the <ulink
      url="https://wiki.gnucash.org/wiki"><application>&app;</application>
@@ -116,15 +118,15 @@
      encounter difficulty using
      <application>&app;</application>.</para>
      <tip><para>You should also try its
-     <ulink url="https://wiki.gnucash.org/wiki/Special:Search">search page</ulink></para></tip>
+     <ulink url="https://wiki.gnucash.org/wiki/Special:Search">search page</ulink>.</para></tip>
    </sect2>
 
    <sect2 id="more_help">
     <title><application>&app;</application> On-line Assistance</title>
      <!-- Translators: if a mailing list in your language exists, add or replace the links in this section
           see https://lists.gnucash.org/mailman/listinfo/ -->
 
-    <bridgehead>Mailing List</bridgehead>
+    <bridgehead>Mailing Lists</bridgehead>
     <para>The primary source of user support is the <ulink
     url="mailto:gnucash-user@gnucash.org">user mailing list</ulink>. If English is not your primary language,
     see <ulink url="https://wiki.gnucash.org/wiki/Mailing_Lists#User_Lists">wiki:user mailing lists</ulink> for local lists. If