Any man sections related to development are not included in the Ventura installation. Worse, the CommandLineTools for Xcode 14.1 install their own man pages here, including sections 2, 3 and others:
/Library/Developer/CommandLineTools/SDKs/macOSX13.0.sdk/usr/share/man
These would only be available to you after that installation when you use the MANPATH environment variable to help man find those buried sections:
export MANPATH="/Library/Developer/CommandLineTools/SDKs/macOSX13.0.sdk/usr/share/man"
Once that is exported, you can verify where the man 3 section is located with this:
man -w 3 intro
/Library/Developer/CommandLineTools/SDKs/macOSX13.0.sdk/usr/share/man/man3/intro.3
The MANPATH just appends that path search to the existing default at /usr/share/man.
Those of us accustomed to development on UNIX systems past expect all of the man sections under /usr/share/man, and having to adjust MANPATH now is just plain annoying.