Clarify support statement

For PAYG listings we have 2 types of listings. One where we sell through
the CSP and one where SUSE is the seller of record, i.e. we list the
product. In the first case the CSP is responsible for L1 & L2 support,
in the latter case SUSE covers the full support. Clarify this by changing
the wording.

xml/cha_introduction.xml

@@ -270,7 +270,7 @@
       </entry>
       <entry>
        <para>
-        by CSP; by &suse; only with priority support
+        by CSP; by &suse; only for SUSE Marketplace listings
        </para>
       </entry>
      </row>