DOC: Clarified how finfo works with complex numbers (#22260)

There was some confusion about how finfo works with complex numbers,
leading to an issue being made requesting that numpy either adds a
cinfo function or changes the documentation of finfo. The submitter of
that issue also linked to an issue for a seperate repository, which also
included conversation about the proposed change. (github.com/data-apis/array-api/issues/433)
In both discussions, there was a general concensus that it would be better
to change the documentation to explain how finfo works instead of
creating a cinfo function.

Since this is just a small documentation change, there's no need
to run the normal checks.

[skip ci]

0 files changed, 0 insertions, 0 deletions