Improve docs for Connector, and make sendContentFeed and sendMultiContentFeed return the GSA response string.
Improve docs for Connector, and make sendContentFeed and sendMultiContentFeed return the GSA response string.

googlearchive/gsa-admin-toolkit,groschovskiy/gsa-admin-toolkit,groschovskiy/gsa-admin-toolkit,IevgenPr/gsa-admin-toolkit,IevgenPr/gsa-admin-toolkit,IevgenPr/gsa-admin-toolkit,googlearchive/gsa-admin-toolkit,groschovskiy/gsa-admin-toolkit,googlearchive/gsa-admin-toolkit,googlearchive/gsa-admin-toolkit,googlearchive/gsa-admin-toolkit,IevgenPr/gsa-admin-toolkit,IevgenPr/gsa-admin-toolkit,groschovskiy/gsa-admin-toolkit,groschovskiy/gsa-admin-toolkit