A suggestion about the usage manual of \d command - Mailing list pgsql-docs

I created a domain object named `numeric` using the following statement: `CREATE DOMAIN numeric AS NUMERIC(12,2) DEFAULT 0 CHECK (VALUE >= 0);` After executing this SQL, it indicated that the domain was created successfully. However, when I executed `\dD` in psql, the created domain could not be displayed.

The reason is that the name I used is the same as a built-in type (of course, similar issues exist not only with domains). However, our manual for the `\dD` command lacks relevant explanations, which can mislead users. Users might think an object was successfully created, but the `\d` command doesn't display it, which could make beginners doubt whether the object was created successfully. I suggest adding necessary explanations to the `\d` command's manual.