update a tiny mistake for create role
it occurred on all the versions.
<plentry>
<pt>CREATEROLE</pt>
<pt>NOCREATEROLE</pt>
- <pd>If <codeph>CREATEDB</codeph> is specified, the role being defined will be
+ <pd>If <codeph>CREATEROLE</codeph> is specified, the role being defined will be
allowed to create new roles, alter other roles, and drop other roles.
<codeph>NOCREATEROLE</codeph> (the default) will deny a role the ability
to create roles or modify roles other than their own. </pd>
