Thread: pgsql: mmgr README tweak: "either" is no longer correct.

Log Message:
-----------
mmgr README tweak: "either" is no longer correct. The previous wording
compared PortalContext with QueryContext, but the latter no longer exists.

Modified Files:
--------------
    pgsql/src/backend/utils/mmgr:
        README (r1.10 -> r1.11)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mmgr/README.diff?r1=1.10&r2=1.11)