[MATH-481] MathUtils.equals(double x, double y) disagrees with Javadoc - ASF JIRA

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MathUtils.equals(double x, double y) disagrees with Javadoc.

The Javadoc says:

Returns true iff they are equal as defined by

{@link #equals(double,double,int)}

However, the code actually uses == and checks for NaN:

public static boolean equals(double x, double y) {
    return (Double.isNaN(x) && Double.isNaN(y)) || x == y;
}

The method is deprecated, but it should probably still be consistent with its documentation.