[bug #59526] doc/groff.texi: Warnings from ? about undefined cross references

[G. Branden Robinson]

Update of bug #59526 (project groff):

                  Status:                    None => Invalid                
             Assigned to:                    None => gbranden               
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #1:

These warnings are normal and to be expected when a build of the groff Texinfo
manual in PDF format is done when:

1. Existing TeX "auxiliary" files still exist from a previous build; and
2. Since that build was performed, one or more nodes have been renamed.

TeX is run multiple times to stabilize the cross references for similar
reasons that ms and mm documents with tables of contents must be produced with
multiple passes of groff.

If there is actual damage to the Info node structure (e.g., a typo in an info
node name, or a consistency problem with node renaming), the build will fail
outright when generating the Info/plain-text form of the manual; this happens
as part of the default make target, so when running simply "make".

To avoid seeing these diagnostics in the future, perform builds of the "doc"
target only from clean checkouts, or "make clean" before "make doc".

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