DOC_TARGETS dropped pdf,man from doc.mk but not the installation guide

[paulo-ferraz-oliveira]

Describe the bug

DOC_TARGETS (introduced "to limit which types of documentation" are built) first appeared in 48ecc7a.

At that moment, it seems the following choices were possible: man, pdf, chunks, and/or html.

A more recent 218ecbe removed targets man and html.

This is not mentioned in the changelog, and the removed values are still mentioned in the upcoming release's (OTP 27) documentation.

To Reproduce

Look at the mentioned files, then look at the documentation.

You can also try to build 27 with make docs DOC_TARGETS='man html pdf chunks', which should show something like

=== Entering application stdlib
make[3]: *** No rule to make target `pdf', needed by `docs'.  Stop

and have the build failed.

Expected behavior

I'm not sure if the removal is the expectation (since it's still in the documentation), or the documentation not being updated was oversight.

Affected versions

• 27.0-rc1

Additional context

In preparing for a newer kerl release it would be important to know what bit is wrong (code or doc) so we can adjust.

[garazdawi]

pdf and man have been dropped in 27. I will send a PR to update the docs accordingly.

[garazdawi]

Fixed in #8129