Update for 14.2.

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+Introduction
+======================
+This version may cohabit with other major versions, including the official one.
+
+Data directory is /var/lib/postgres/data14
+
+Initialize the database
+=======================
+    su - postgres
+    . /opt/postgresql14/bin/pgenv.sh
+    initdb -k
+
+Start the service
+=================
+    systemctl start postgresql14
+
+Use the service
+================
+    . /opt/postgresql14/bin/pgenv.sh
+    psql -U postgres