This option tells FPDOC where the output file should be generated. How this option is
interpreted depends on the format that is used. For latex, this is interpreted as the
filename for the tex file. For all other formats, this is interpreted as the directory where all
documentation files will be written. The directory will be created if it does not yet
exist.
The filename or directory name is interpreted as relative to the current directory.
Example:
--format=html --output=docs/classes
will generate HTML documentation in the directory docs/classes.
--format=latex --output=docs/classes.tex
will generate latex documentation in the file docs/classes.