Added link to the Soap Schema under the section CAOS. Also improved the description of the versioning to align with the CAOS API.
Added link to the Soap Schema under the section CAOS. Also improved the
description of the versioning to align with the CAOS API.

UW-Madison-DoIT/caos-php-client,UW-Madison-DoIT/caos-php-client,ahoffmann-wi/caos-php-client