BUG #5449: "elements" are not parameter

The following bug has been logged online:

Bug reference:      5449
Logged by:          KOIZUMI Satoru
Email address:      koizumistr@minos.ocn.ne.jp
PostgreSQL version: 9.0beta1
Operating system:   MacOS X
Description:        "elements" are not parameter
Details:

At Table F-7 "elements" are enclosed by <parameter>.

| <entry>portion of array starting at position
| <parameter>start</>, len <parameter>elements</></entry>

But a parameter of subarray() is "len", not "element", so the sentence would
be the following:

| <entry>portion of array starting at position
| <parameter>start</>, <parameter>len</> elements</entry>