Sandro Tosi fe2c74cb1a Update location of `usage.rst` to fix manpage compilation ... `usage.rst` has been moved from `doc/en` to `doc/en/how-to`, so the `man_pages` configuration value needs to be updated to the new location, so that we dont get this warning: writing... WARNING: "man_pages" config value references unknown document usage		2022-06-07 14:43:34 -04:00
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en	Update location of `usage.rst` to fix manpage compilation	2022-06-07 14:43:34 -04:00