message: Expanding the description of `LpErrorEstimator`
diff: @@ -307,8 +307,13 @@ public:
  /** @brief The LpErrorEstimator class compares the solution to a known
  coefficient.
  - The class supports either scalar or vector coefficients and works both
  - in serial and in parallel.
  + This class can be used, for example, to adapt a mesh to a
  + non-trivial initial condition in a time-dependent simulation. It
  + can also be used to force refinement in the neighborhood of small
  + features before switching to a more traditional error estimator.
  +
  + The LpErrorEstimator supports either scalar or vector coefficients
  + and works both in serial and in parallel.
  */
  class LpErrorEstimator : public ErrorEstimator
  {
  