Fix multiexcerpt macros that lead to lost content in wiki

Since wiki migration, some pages are missing content because they were using a "multiexcerpt-include" macro.

Samples are:
https://nuxeowiki.atlassian.net/wiki/spaces/Connect/pages/2737019/Create+a+New+Customer+and+the+Associated+Contract+in+Nuxeo+Connect
https://nuxeowiki.atlassian.net/wiki/spaces/Connect/pages/2737034/How+Automatic+Trial+Cleanup+Works

These doc pages are critical for support, presales and other people using connect to handle accounts, we would need to have the content restored.