Code Section 44-15-3 does not apply if and to the extent that the applicable gift instrument indicates the donor's intention that income of an institutional fund shall not be accumulated or shall not be added to the principal of the fund or that net appreciation shall not be expended. A restriction against accumulation or addition to principal or upon the expenditure of net appreciation may not be implied from a designation of a gift as an endowment fund or from a direction or authorization in the applicable gift instrument to apply to the uses and purposes of the fund the "income," "interest," "dividends," "currently expendable income," or "rent, issues, or profits" or a direction which contains other words of similar import. This rule of construction applies to gift instruments executed or in effect before or after March 28, 1984.