tdf#98153  add mention and link to document filters

  + add variable to a paragraph that gives link to document filters
  + use variable to embed paragraph in the --in-filter parameter

Change-Id: If93918b17b681fd5e87e4495c5bd3a122b770a5b
Reviewed-on: https://gerrit.libreoffice.org/c/help/+/111888
Reviewed-by: Seth Chaiklin <sdc.blanco@youmail.dk>
Tested-by: Jenkins
diff --git a/source/text/shared/guide/start_parameters.xhp b/source/text/shared/guide/start_parameters.xhp
index b87cc0c..248aa8e 100644
--- a/source/text/shared/guide/start_parameters.xhp
+++ b/source/text/shared/guide/start_parameters.xhp
@@ -195,6 +195,7 @@
                <paragraph role="tablecontent" id="par_id315053o" xml-lang="en-US">Forces an input filter type, if possible. For example:</paragraph>
                <paragraph role="paragraph" id="par_id411550934641187" localize="false"><input>--infilter="Calc Office Open XML"</input></paragraph>
                <paragraph role="paragraph" id="par_id501550934647297" localize="false"><input>--infilter="Text (encoded):UTF8,LF,Liberation Mono,en-US"</input>.</paragraph>
                <embed href="text/shared/guide/start_parameters.xhp#seefilters"/>
            </tablecell>
        </tablerow>
        <tablerow>
@@ -532,7 +533,7 @@
                <paragraph role="tablecontent" id="par_id311550932952863" localize="false"><input>--convert-to pdf:writer_pdf_Export --outdir /home/user *.doc</input></paragraph>
                <paragraph role="tablecontent" id="par_id231550932985601" localize="false"><input>--convert-to "html:XHTML Writer File:UTF8" *.doc</input></paragraph>
                <paragraph role="tablecontent" id="par_id211550932999288" localize="false"><input>--convert-to "txt:Text (encoded):UTF8" *.doc</input></paragraph>
                <paragraph role="paragraph" id="par_id781554408625219">See the <link href="text/shared/guide/convertfilters.xhp" name="list of document filters">list of document filters</link> for file conversion.</paragraph>
                <paragraph role="paragraph" id="par_id781554408625219"><variable id="seefilters">See the <link href="text/shared/guide/convertfilters.xhp" name="list of document filters">list of document filters</link> for file conversion.</variable></paragraph>
            </tablecell>
        </tablerow>
        <tablerow>