bug#41282: doc: dot graphs display square glyphs instead of letters

[Pierre Neidhardt]

Recipe in Emacs:

- C-h i
- m Guix RET
- i bootstrap RET
- m Reduced Binary Seed Bootstrap

> Do you have any fonts installed?

I have font-dejavu, that's it.

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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