This is consistent with the existing obsolete error code naming
convention.

... from the CINIT() enum

We now provide the "real" names in the CINIT() macro setup for CURLOPT_*
symbols, and we provide backwards compatibility defines for the old
symbols as defines instead of vice versa.

This allows us to better use the CINIT() list to check for existing and
current option names.

with a bonus first rough 'mancheck' target to see which man pages that
are still missing

First explain the data then describe what the callback should return.

Suggestions-by: Jeff Pohlmeyer

Inludes all the sections to consider.