Clarify that a non-specified precision NUMERIC has a very high range.

Author: bmomjian

doc/src/sgml/datatype.sgml

@@ -529,8 +529,9 @@ NUMERIC
      <para>
       The maximum allowed precision when explicitely specified in the
       type declaration is 1000; otherwise the current implementation
-      of the <type>NUMERIC</type> is subject to the limits described
-      in <xref linkend="datatype-numeric-table">.
+      of <type>NUMERIC</type> (when the precision is not specified)
+      is subject to the limits described in <xref
+      linkend="datatype-numeric-table">.
      </para>
     </note>