* providing clarity on airdrop amount constraints
This change is in response to a review of a PR in the `solana-program-library` found here: https://github.com/solana-labs/solana-program-library/pull/3062
* replaced static limits with info on how to find them
* removed trailing whitespace
(cherry picked from commit 781094edb2
)
Co-authored-by: T.J. Kyner <78994885+tjkyner@users.noreply.github.com>