Add docs for the hooks that alter relevant assets in the Mosaico interface
Add docs for the hooks that alter relevant assets in the Mosaico interface

veda-consulting/uk.co.vedaconsulting.mosaico,veda-consulting/uk.co.vedaconsulting.mosaico,veda-consulting/uk.co.vedaconsulting.mosaico,veda-consulting/uk.co.vedaconsulting.mosaico