message: DOC: improve Extent class doxygen documentation
diff: @@ -61,9 +61,9 @@ public:
  * \param [in] ndims the number of dimensions.
  * \param [in] ext pointer to buffer consisting of the extent information.
  *
  - * \note The supplied ext pointer must point to a buffer that has at least
  - * \f$ 2 \times ndims \f$ entries. For each dimension the extent stores the
  - * min and max values of the extent. Specifically, given a pointer to the
  + * \note The supplied `ext` pointer must point to a buffer that has at least
  + * \f$ 2 \times N \f$ entries, where N is the dimension of the uniform mesh
  + * given in the following order: [imin, imax, jmin, jmax, kmin, kmax]
  *
  * \pre ndims >= 1 && ndims <= 3
  * \pre ext != AXOM_NULLPTR
  