Update text of terminate:

< * Allow administrators to safely terminate individual sessions
<
<   Right now, SIGTERM will terminate a session, but it is treated as
<   though the postmaster has paniced and shared memory might not be
<   cleaned up properly.  A new signal is needed for safe termination
<   because backends must first do a query cancel, then exit once they
<   have run the query cancel cleanup routine.
<
> * Allow administrators to safely terminate individual sessions either
>   via an SQL function or SIGTERM