[DOCS] can't reproduce example

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.5/static/rangetypes.html
Description:

I tried to reproduce the example : 
CREATE EXTENSION btree_gist;
CREATE TABLE room_reservation (   room text,   during tsrange,   EXCLUDE USING GIST (room WITH =, during WITH
&&)
);

but I got this error :
ERROR:  data type text has no default operator class for access method
"gist"
HINT:  You must specify an operator class for the index or define a default
operator class for the data type.

That means by default nobody is able to reproduce your example... Howto use
gist with text or varchar?

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