TRD: Issues on cover page for book for meta

[tomschr]

Problem Description

Bryan provided some steps via email which I could confirm:

1. git clone git@github.com:SUSE/technical-reference-documentation.git

2. cd technical-reference-documentation/linux/start/jupyter

3. Do a quick sample build:

   daps --force -d DC-gs_sles_jupyter-jupyterlab_container html
   

4. Edit adoc/gs_sles_jupyter-jupyterlab_container-docinfo.xml:

    <productname>{productname}</productname>
    <meta name="platform">{platform1}</meta>
    <meta name="platform">foo</meta>
    <meta name="platform">bar</meta>

5. Rebuild html, html --single, and pdf outputs:

   daps --force -d DC-gs_sles_jupyter-jupyterlab_container <outputFormat>
   

   => you will see the listings of the three platforms on the title pages on distinct lines

6. Edit DC-gs_sles_jupyter-jupyterlab_container:

   #ADOC_TYPE="article"
   ADOC_TYPE="book"
   

7. Edit adoc/gs_sles_jupyter-jupyterlab_container-docinfo.xml:

   <!-- <title>{title}</title> -->
   

8. Rebuild html, html, --single and pdf outputs:

   daps --force -d DC-gs_sles_jupyter-jupyterlab_container <outputFormat>
   

   => you will see html html --single still look fine, but pdf will show "SUSE Linux Enterprise Server 15foobar" on one line on the title page

Expected Behaviour

The titlepage should show the meta information on distinct lines.