[flux][shallowwater] fix typos

dumux/flux/shallowwater/exactriemann.hh

@@ -43,7 +43,7 @@ struct RiemannSolution {
  * \ingroup ShallowWaterFlux
  * \brief Exact Riemann solver for the shallow water equations.
  *
- * The flux of the 2D shallow water euqations must be rotated
+ * The flux of the 2D shallow water equations must be rotated
  * to a 1D problem before the Riemann solver can be applied.
  * The computed water flux is given in m^2/s, the momentum
  * fluxes are given in m^3/s^2.

dumux/flux/shallowwater/riemannproblem.hh

@@ -42,8 +42,8 @@ namespace ShallowWater {
  * one-dimensional problem and solves this new problem, and rotates
  * the problem back. Further it applies an flux limiter for the water
  * flux handle drying of elements.
- * The correction of the bed slope surce term leads to an
- * non-symetric flux term at the interface for the momentum equations
+ * The correction of the bed slope source term leads to a
+ * non-symmetric flux term at the interface for the momentum equations
  * since DuMuX computes the fluxes twice from each side this does not
  * matter.
  *