Clarify `ServiceManagerBase.createAVSRewardsSubmission` docs

[MegaRedHand]

The function docs says:

eigenlayer-middleware/src/ServiceManagerBase.sol

Lines 143 to 144 in 9785099

	* @dev This function will revert if the `rewardsSubmission` is malformed,
	* e.g. if the `strategies` and `weights` arrays are of non-equal lengths

But there's a single array that contains both strategies and multipliers. We should clarify or remove this part.