tdf#129918 Add right bookmark for Elements panel

The Elements panel has no target page for F1 key.
This patch adds the bookmark for Elements widgets.

Change-Id: Ic8d5a0042812f76ca218fada34a40002e2175b90
Reviewed-on: https://gerrit.libreoffice.org/c/help/+/87350
Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
diff --git a/source/text/smath/01/03090000.xhp b/source/text/smath/01/03090000.xhp
index 2941231..2e362a8 100644
--- a/source/text/smath/01/03090000.xhp
+++ b/source/text/smath/01/03090000.xhp
@@ -28,13 +28,16 @@
   </meta>
   <body>
      <section id="auswahl">
<bookmark xml-lang="en-US" branch="index" id="bm_id3155963"><bookmark_value>selection options in formulas</bookmark_value>
         <bookmark_value>formulas; selections</bookmark_value>
         <bookmark_value>elements;in Math</bookmark_value>
<bookmark xml-lang="en-US" branch="index" id="bm_id3155963">
<bookmark_value>selection options in formulas</bookmark_value>
<bookmark_value>formulas; selections</bookmark_value>
<bookmark_value>elements;in Math</bookmark_value>
</bookmark>
<bookmark xml-lang="en-US" branch="hid/.uno:ToolBox" id="bm_id3777779" localize="false"/>
<paragraph xml-lang="en-US" id="hd_id3155963" role="heading" level="1"><variable id="func_win"><link href="text/smath/01/03090000.xhp" name="Elements">Elements</link>
</variable></paragraph>
<bookmark xml-lang="en-US" branch="hid/modules/smath/ui/dockingelements/listbox" id="bm_id71579880184043" localize="false"/>
<bookmark xml-lang="en-US" branch="hid/modules/smath/ui/dockingelements/box" id="bm_id921579880253411" localize="false"/>
<h1 id="hd_id3155963"><variable id="func_win"><link href="text/smath/01/03090000.xhp" name="Elements">Elements</link>
</variable></h1>
         <paragraph xml-lang="en-US" id="par_id3149500" role="paragraph"><ahelp hid="SID_TOOLBOX">This is a list of operators, functions, symbols and format options that can be inserted into the formula.</ahelp></paragraph>
      </section>
      <paragraph xml-lang="en-US" id="par_id3148699" role="paragraph">Some <link href="text/smath/01/03090900.xhp" name="examples">examples</link> show you the range of operations.</paragraph>
@@ -59,4 +62,4 @@
         <embed href="text/smath/01/03091500.xhp#reference"/>
      </section>
   </body>
</helpdocument>
</helpdocument>