Doc patch: type modifiers

From
http://developer.postgresql.org/pgdocs/postgres/sql-createtype.html :

type_modifier_input_function

        The name of a function that converts numeric modifier(s) for the
        type into internal form.

type_modifier_output_function

        The name of a function that converts the internal form of the
        type's modifier(s) to external textual form.

But the paragraph above says:

"...take one or more simple constants or identifiers as modifiers..."

So in the description of the input function, "numeric" is wrong, and
should be something like "textual" (for the sake of symmetry).

Patch attached.

Regards,
    Jeff Davis