minor fixes

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$$

  E_{a} = K_2\left(\theta - \theta_0\right)^2 + K_3\left(\theta - \theta_0\right)^3 + K_4\left(\theta - \theta_0\right)^4 + K_5\left(\theta - \theta_0\right)^5 + K_6\left(\theta - \theta_0\right)^6

$$

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:doc:`fix phonon <fix_phonon>`

:doc:`compute hma <compute_hma>` uses an analytic formulation of the

Hessian provided by a pair_style's Pair::single\_hessian() funcion,

Hessian provided by a pair_style's Pair::single\_hessian() function,

if implemented.

Default