small fixes

tutorial/t6.geo

@@ -147,10 +147,10 @@ Transfinite Line{32,27,49,45,43} = nbpt_shell ;
 Transfinite Line{33,28,46,50,52} = nbpt_far Using Progression 1.2 ;
 Transfinite Line{34,29,51,47,53} = nbpt_inf Using Progression 1.05;
 
-// 2. Transfinite surfaces are defined by an ordered list of their
-// vertices (the ordering of these vertices defines the ordering of
-// the mesh elements). Note that a transfinite surface can only have 3
-// or 4 sides:
+// 2. Transfinite surfaces are defined by an ordered list of the
+// points on their boundary (the ordering of these points defines the
+// ordering of the mesh elements). Note that a transfinite surface can
+// only have 3 or 4 sides:
 
 Transfinite Surface{55} = {1,14,16,18};
 Transfinite Surface{57} = {14,2,19,16};
@@ -190,9 +190,9 @@ Transfinite Surface{103} = {24,23,25,26};
 Transfinite Surface{119} = {9,26,25};
 Transfinite Surface{117} = {13,5,25,26};
 
-// 3. Transfinite volumes are also defined by an ordered list of their
-// vertices (the ordering defines the ordering of the mesh elements).
-// A transfinite volume can only have 6 or 8 faces:
+// 3. Transfinite volumes are also defined by an ordered list of the
+// points on their boundary (the ordering defines the ordering of the
+// mesh elements).  A transfinite volume can only have 6 or 8 faces:
 
 Transfinite Volume{129} = {1,14,15,18,16,17};
 Transfinite Volume{131} = {17,16,14,15,20,19,2,10};