Update get_box_mesh function documentation to include tagged boundary…

… faces

Co-authored-by: Matt Smith <mjsmith1@gmail.com>

mirgecom/simutil.py

@@ -94,7 +94,7 @@ def get_number_of_tetrahedron_nodes(dim, order, include_faces=False):
 
 def get_box_mesh(dim,a,b,n, t=None, periodic=None):
     """
-    Creates a rectangular "box" like mesh using function generate_regular_rect_mesh
+    Creates a rectangular "box" like mesh with tagged boundary faces.
 
     Ensures parameters needed for generate_regular_rect_mesh are satisfied
     a,b,n,periodic are tuples of dimension = dim and are converted if not in this format