Clarify some behaviours of REASSIGN OWNED and DROP OWNED BY.

doc/src/sgml/ref/drop_owned.sgml

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@@ -92,6 +92,10 @@ DROP OWNED BY <replaceable class="PARAMETER">name</replaceable> [, ...] [ CASCAD
    reassigns the ownership of all the database objects owned by one or
    more roles.
   </para>
+
+  <para>
+   Databases owned by the role(s) will not be removed.
+  </para>
  </refsect1>
 
  <refsect1>

doc/src/sgml/ref/reassign_owned.sgml

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@@ -73,10 +73,17 @@ REASSIGN OWNED BY <replaceable class="PARAMETER">old_role</replaceable> [, ...]
    that contains objects owned by a role that is to be removed.
   </para>
 
+  <para>
+   <command>REASSIGN OWNED</command> requires privileges on both the
+   source role(s) and the target role.
+  </para>
+
   <para>
    The <xref linkend="sql-drop-owned"
     endterm="sql-drop-owned-title"> command is an alternative that
-   drops all the database objects owned by one or more roles.
+   drops all the database objects owned by one or more roles. Note
+   also that <command>DROP OWNED</command> requires privileges only
+   on the source role(s).
   </para>
 
   <para>