Clarify in API and Guides for bond() and unbond() if amount is in whole NTN/LNTN or attoton

[cmjc]

Description

The docs should make it clearer in the guides and API reference if an amount is specified in Autonity's wei equivalent attoton, or in whole NTN/LNTN.

Ref: https://docs.autonity.org/concepts/protocol-assets/auton/#unit-measures-of-auton

Rationale

Improve docs quality and reader UX.

Implementation

Review docs

[aiman]

Strictly speaking, NTN and LNTN are not denominated in Wei, but rather have their own independent decimals setting.

[cmjc]

Edited to reference https://docs.autonity.org/concepts/protocol-assets/auton/#unit-measures-of-auton.