BUG #7490: documentation typo

The following bug has been logged on the website:

Bug reference:      7490
Logged by:          mauro
Email address:      m.russo@uniplan.it
PostgreSQL version: 9.1.4
Operating system:   no matter
Description:=20=20=20=20=20=20=20=20

Dears,

in

http://www.postgresql.org/docs/9.1/static/functions-string.html

the example

overlay('Txxxxas' placing 'hom' from 2 for 4)

should be corrected : 'homa' instead of 'hom'.