fix-docsize.sh errors in make doc

[Jean Abou Samra]

Hi,

Towards the end of the process, `make doc` outputs warnings coming from 
fix-docsize.sh. This occurs in CI too. Any ideas?

Best,
Jean

fix-docsize.sh: changes.ca.pdf not accessible from 
/builds/lilypond/lilypond/build/out-www/offline-root/Documentation/web-big-page.ca.html
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fix-docsize.sh: contribuïdor-big-page.html not accessible from 
/builds/lilypond/lilypond/build/out-www/offline-root/Documentation/web-big-page.ca.html
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fix-docsize.sh: contribuïdor.ca.pdf not accessible from 
/builds/lilypond/lilypond/build/out-www/offline-root/Documentation/web-big-page.ca.html
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fix-docsize.sh: essay.ca.pdf not accessible from 
/builds/lilypond/lilypond/build/out-www/offline-root/Documentation/web-big-page.ca.html
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fix-docsize.sh: extending.ca.pdf not accessible from 
/builds/lilypond/lilypond/build/out-www/offline-root/Documentation/web-big-page.ca.html
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fix-docsize.sh: internals.ca.pdf not accessible from 
/builds/lilypond/lilypond/build/out-www/offline-root/Documentation/web-big-page.ca.html
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fix-docsize.sh: music-glossary.ca.pdf not accessible from 
/builds/lilypond/lilypond/build/out-www/offline-root/Documentation/web-big-page.ca.html
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fix-docsize.sh: snippets.ca.pdf not accessible from 
/builds/lilypond/lilypond/build/out-www/offline-root/Documentation/web-big-page.ca.html
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fix-docsize.sh: contributor.es.pdf not accessible from 
/builds/lilypond/lilypond/build/out-www/offline-root/Documentation/web-big-page.es.html
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fix-docsize.sh: internals.es.pdf not accessible from 
/builds/lilypond/lilypond/build/out-www/offline-root/Documentation/web-big-page.es.html
||
fix-docsize.sh: music-glossary.es.pdf not accessible from 
/builds/lilypond/lilypond/build/out-www/offline-root/Documentation/web-big-page.es.html
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fix-docsize.sh: ../changes-big-page.ca.html not accessible from 
/builds/lilypond/lilypond/build/out-www/offline-root/Documentation/web/changes.ca.html
[Many more...]
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