I am assuming this message is linked to the Linux man pages. It mentions, for read(2), how read is read from a file descriptor.
So does for more information see read(2) just mean to check out the man page for read(2) for proper usage of the read command?
Thanks for the help!
It means to read the 2 page for the function (read, in this case) from the man pages. The command is: man x function where x is the page number.