portfolio/tags: Incl. info on journal entries being text

To make it clearer that the "Text" filter also
displays journal entries.

source/portfolio/tags.rst

@@ -88,7 +88,7 @@ On the *My tags* page you see all your tags and the artefacts and pages associat
    * **All**: Displays all results.
    * **Files**: Shows any files.
    * **Images**: Displays only images tagged with that particular tag.
-   * **Text**: Only shows text.
+   * **Text**: Only shows text, including journal entries.
    * **Pages**: Shows only results from your pages.
    * **Collections**: Retrieves only collections that you tagged.