Even just a link to the documentation for those would be very helpful as a "Looking for this? It's <here>" for the special character documentation that David mentioned would have been extremely helpful IMHO.
Not sure where you are expecting this "link to the documentation" to exist...
"SQL Syntax" is a top-level item in the Table of Contents of the documentation; Under that "Constants" seems like the right thing to call these hand-written literals so that seems adequate as well. Given your background in programming languages I would expect those two headings to be sufficient to point you to the correct location in the documentation to learn how to write SQL literals. Everyone has unique experiences though and that's why the lists exist. The -general list would be a more appropriate place to make sure inquiries though as this isn't a bug.
