Doc: point users to ways to override the default opam root location in the opam init manpage #6251
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Might have helped #6250.
--root
and$OPAMROOT
aren't very well documented inopam init
. The concept of an "opam root" is mentioned but the option is very far down the man page and the environment variable even more.So i feel like, for such a useful command, it should be mentioned in the top summary.