Update vtkCurvatures.h doc that poorly render with Doxygen

Filters/General/vtkCurvatures.h

@@ -21,31 +21,32 @@
  *
  * Gauss Curvature
  * discrete Gauss curvature (K) computation,
- * \f$K(vertex v) = 2*PI-\sum_{facet neighbs f of v} (angle_f at v)\f$
- * The contribution of every facet is for the moment weighted by \f$Area(facet)/3\f$
- * The units of Gaussian Curvature are \f$[1/m^2]\f$
+ * \f$K(\text{vertex v}) = 2*\pi - \sum_{\text{facet neighbs f of v}} (\text{angle_f at v})\f$.
+ * The contribution of every facet is for the moment weighted by \f$Area(facet)/3\f$.
+ * The units of Gaussian Curvature are \f$[1/m^2]\f$.
  *
  * Mean Curvature
- * \f$H(vertex v) = average over edges neighbs e of H(e)\f$
- * \f$H(edge e) = length(e)*dihedral_angle(e)\f$
+ * \f$H(vertex v) = \text{average over edges neighbs e of H(e)}\f$,
+ * \f$H(edge e) = length(e) * dihedral\_angle(e)\f$.
+ *
  * NB: dihedral_angle is the ORIENTED angle between -PI and PI,
  * this means that the surface is assumed to be orientable
- * the computation creates the orientation
- * The units of Mean Curvature are [1/m]
+ * the computation creates the orientation.
+ * The units of Mean Curvature are [1/m].
  *
- * Maximum (\f$k_max\f$) and Minimum (\f$k_min\f$) Principal Curvatures
- * \f$k_max = H + sqrt(H^2 - K)\f$
- * \f$k_min = H - sqrt(H^2 - K)\f$
- * Excepting spherical and planar surfaces which have equal principal curvatures,
- * the curvature at a point on a surface varies with the direction one "sets off"
- * from the point. For all directions, the curvature will pass through two extrema:
- * a minimum (\f$k_min\f$) and a maximum (\f$k_max\f$) which occur at mutually orthogonal
- * directions to each other.
+ * Maximum (\f$k_\max\f$) and Minimum (\f$k_\min\f$) Principal Curvatures
+ * \f$k_\max = H + \sqrt{H^2 - K}\f$,
+ * \f$k_\min = H - \sqrt{H^2 - K}\f$
+ * Excepting spherical and planar surfaces which have equal principal
+ * curvatures, the curvature at a point on a surface varies with the direction
+ * one "sets off" from the point. For all directions, the curvature will pass
+ * through two extrema: a minimum (\f$k_\min\f$) and a maximum (\f$k_\max\f$)
+ * which occur at mutually orthogonal directions to each other.
  *
- * NB. The sign of the Gauss curvature is a geometric ivariant, it should be +ve
- * when the surface looks like a sphere, -ve when it looks like a saddle,
- * however, the sign of the Mean curvature is not, it depends on the
- * convention for normals - This code assumes that normals point outwards (ie
+ * NB. The sign of the Gauss curvature is a geometric invariant, it should be
+ * positive when the surface looks like a sphere, negative when it looks like a
+ * saddle, however the sign of the Mean curvature is not, it depends on the
+ * convention for normals. This code assumes that normals point outwards (i.e.
  * from the surface of a sphere outwards). If a given mesh produces curvatures
  * of opposite senses then the flag InvertMeanCurvature can be set and the
  * Curvature reported by the Mean calculation will be inverted.