Fix dblquad and tplquad not accepting float boundaries #8661
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This is a simple fix to make dblquad() and tplquad() functions accept numbers (instead of just functions) as boundaries for the integration. I'm not sure if the previous behaviour was a bug or done like that on purpose, but since nquad() (which dblquad and tplquad use) accepts numbers as boundaries, it seemed inconsistent to me.
I also changed the documentation and added a simple unit test to reflect this change.