Attorney’s fees — Proposal for settlement — Identical proposals for settlement made to two separate defendants were not ambiguous and were enforceable — Where each proposal consistently used the singular term “plaintiff” and indicated that each proposal was designed to settle “any and all claims of plaintiff against defendant,” it is clear that plaintiff offered to settle his claims with only the defendant specified in the proposal — District court erred in finding that the proposals were ambiguous as to whether acceptance of one of the proposals would have resolved the case against both defendants or only against the individual respondent accepting the proposal