(HTCONDOR-857)  Add stable-series release note.
(HTCONDOR-857)  Add stable-series release note.

htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor