feature-doc-conn: Minor adjustements

doc/doxygen/connectivity.dox

@@ -36,7 +36,7 @@
  * the domain with a conforming mesh of (potentially mapped) squares (2D) or
  * cubes (3D). Each square (2D) or cube (3D) represents a quadtree (2D) or
  * octree (3D) root. These trees are connected with respect to their root's
- * topological entities, i.e. in 2D corners and faces and in 3D corner, faces
+ * topological entities, i.e. in 2D corners and faces and in 3D corners, faces
  * and edges. This coarsest possible mesh is defined as the connectivity of a
  * forest.
  * It can not be changed during a simulation and in particular it can not be
@@ -104,8 +104,8 @@
  * The vertices are stored in the double array
  * [vertices](\ref p4est_connectivity_t::vertices).
  * It is important to note
- * that the vertices are always points in three-dimensional space; even in the
- * [2D connectivity](\ref p4est_connectivity_t).
+ * that the vertices are always points in the three-dimensional space; even in
+ * the [2D connectivity](\ref p4est_connectivity_t).
  * The [vertices](\ref p4est_connectivity_t::vertices) are used to embed each
  * tree into the three-dimensional space in the array
  * [tree_to_vertex](\ref p4est_connectivity_t::tree_to_vertex). This embedding
@@ -134,8 +134,8 @@
  * p4est_connectivity.h (2D) and \ref p8est_connectivity.h (3D).
  * In particular, you can find there functions for
  * [writing](\ref p4est_connectivity_save) and
- * [reading](\ref p4est_connectivity_load) a connectivity in p4est internal file
- * format.
+ * [reading](\ref p4est_connectivity_load) a connectivity in a p4est internal
+ * file format.
  * There are also functions to manipulate connectivity objects, e.g. one
  * can use METIS -- if it is available -- to
  * [reorder](\ref p4est_connectivity_reorder) a connectivity.