Update the documentation for the :autosave option
Update the documentation for the :autosave option

I've noticed a caveat with the :autosave option biting people before.
Questions arise about why they must explicitly save an associated object
in their own before_save callbacks. I've updated the documentation as
such to note to users that the :autosave callback occurs before any
user defined callbacks. They must save the associated record themselves
if altering it in their own callbacks.

Signed-off-by: David Celis <aa743a0aaec8f7d7a1f01442503957f4d7a2d634@davidcelis.com>

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