epsilonWallFunction: Expression of espilon in log layer

In this documentation page about epsilonWallFunction, the expression of

$\epsilon_\text{log}$

is given by:

$$\epsilon_\text{log} = wC_\mu\frac{k^{3/2}}{\nu_{t,w}y} \tag{1}$$

However, in the source code, the following expression is used:

$$\epsilon_\text{log} = wC_{\mu}^{3/4}\frac{k^{3/2}}{\kappa y} \tag{2}$$

Unless the expressions

$\frac{C_\mu}{\nu_{t,w}}$

and

$\frac{C_{\mu}^{3/4}}{\kappa}$

are equivalent, the expression (1) should be corrected in the documentation.

Thank you

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