Warnings from asciidoc

[Hal Murray]

Sanjeev Gupta said:
> If I am reading the ci.yaml file right,the docs are being built only on an
> Alpine image,not on Fedora, etc. 

That seems unlikely.  I'd expect our doc to build on any system that supports 
asciidoc.  Maybe not on an old version of asciidoc: configure checks for 
asciidoc version >= 8.6.0

You do have to configure with --enable-doc.

For me, I get the warnings on Fedora but not on Debian.


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