Add note on params that only work with background callbacks

[LiamConnors]

@T4rk1n do you know if there are any other params that only apply to background callbacks.

This PR relates to this issue https://github.com/plotly/ddk-dash-docs/issues/3318
which is specifically related to the cancel param, but I think it's the same for the rest of these.

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[T4rk1n]

Running is available for regular callbacks since 2.16

[T4rk1n]

@T4rk1n do you know if there are any other params that only apply to background callbacks.

There is only interval but the wording in the docstring already implies background callbacks.

[gvwilson]

The prose looks good, but I'll defer to @T4rk1n on correctness.

[T4rk1n]

💃