Modify error message when timeout is less than TIMEOUT_DEFAULT

[remeio]

When timeout is zero(0), this method setTimeout runs normally, it will not throw the IlleglArgumentException. In other words, zero is valid timeout for this method. The valid arguments:

• TIMEOUT_DEFAULT(-1)
• Zero(0)
• Positive integer(>=1)

So, I think non-negative is better in this method.

(Actually when timeout is zero, it will throw TransactionTimedOutException on transaction starting)

[simonbasle]

A zero timeout is indeed a valid input, and it is up to the underlying transaction implementation to interpret this.
Of particular note is how this gets interpreted if the 0 is passed down to a Jakarta UserTransaction:

If the value is zero, the transaction service restores the default value. If the value is negative a SystemException is thrown.