ENH: meshQualityDict: fixed comment

etc/caseDicts/meshQualityDict

@@ -45,7 +45,8 @@ minTetQuality 1e-15;
 minArea -1;
 
 //- Minimum face twist. Set to <-1 to disable. dot product of face normal
-// and face centre triangles normal
+//  (itself the average of the triangle normals)
+//  and face centre triangles normal
 minTwist 0.02;
 
 //- Minimum normalised cell determinant. This is the determinant of all
@@ -63,9 +64,8 @@ minFaceWeight 0.05;
 //- Volume ratio of neighbouring cells (0 -> 1)
 minVolRatio 0.01;
 
-//- Per triangle normal compared to average normal. Like face twist
-//  but now per (face-centre decomposition) triangle. Must be >0 for Fluent
-//  compatibility
+//- Per triangle normal compared to that of preceding triangle. Must be >0
+//  for Fluent compatibility
 minTriangleTwist -1;