Add info about the new 'Undo close tab' menu item and closing tabs with MMB

doc/index.docbook

@@ -34,8 +34,8 @@ Context menu actions like Rename Bookmarks etc.)
 			<!-- TRANS:ROLES_OF_TRANSLATORS -->
 		</authorgroup>
 		<legalnotice>&FDLNotice;</legalnotice>
-		<date>2019-11-02</date>
-		<releaseinfo>1.9 (Applications 19.12)</releaseinfo>
+		<date>2020-01-08</date>
+		<releaseinfo>1.10 (Applications 20.04)</releaseinfo>
 		<!-- Abstract about this handbook -->
 		<abstract>
 			<para>&okular; is a &kde; universal document viewer based on &kpdf; code.</para>
@@ -96,6 +96,12 @@ Context menu actions like Rename Bookmarks etc.)
 			  <para>
 			    The new document will be opened in a new tab should the <guilabel>Open new files in tabs</guilabel> option on the <link linkend="configgeneral">General configuration page</link> is checked.
 			  </para>
+                          <para>
+                              You can close the tab by clicking with &MMB; on it.
+                          </para>
+                          <para>
+                              The previously closed document in a tab can be reopened using the <menuchoice><shortcut><keycombo action="simul">&Ctrl;&Shift;<keycap>T</keycap></keycombo></shortcut><guimenu>File</guimenu> <guimenuitem>Undo close tab</guimenuitem></menuchoice> menu item.
+                          </para>
 			</important>
 			<para>
 				If you have already opened files in &okular; before, you can quickly access them by selecting them in
@@ -1104,6 +1110,23 @@ Context menu actions like Rename Bookmarks etc.)
 					</listitem>
 				</varlistentry>
 
+				<varlistentry>
+					<term>
+						<menuchoice>
+							<shortcut>
+							<keycombo action="simul">&Ctrl;&Shift;<keycap>T</keycap></keycombo>
+							</shortcut>
+							<guimenu>File</guimenu>
+							<guimenuitem>Undo close tab</guimenuitem>
+						</menuchoice>
+					</term>
+					<listitem>
+						<para>
+							<action>Reopen</action> the last closed document. This action is active only if you have closed some document in tab during the current session.
+						</para>
+					</listitem>
+				</varlistentry>
+
 				<varlistentry>
 					<term>
 						<menuchoice>