change float to number in api parameter definition
change float to number in api parameter definition

This got merged in at the same time as my change that adds an error if
you specify an invalid type.

Change-Id: Iec37f2dc967d38752eb643dbdbbf5584e0ba08fb
Reviewed-on: https://gerrit.instructure.com/70688
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Product-Review: Brian Palmer <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@instructure.com>
QA-Review: Brian Palmer <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@instructure.com>
Tested-by: Brian Palmer <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@instructure.com>

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