don't change options that could affect other tutorials in weird ways

tutorial/t10.geo

@@ -29,7 +29,7 @@ Line Loop(5) = {1,2,3,4}; Plane Surface(6) = {5};
 Field[1] = Attractor;
 Field[1].NodesList = {5};
 Field[1].NNodesByEdge = 100;
-Field[1].EdgesList = {1};
+Field[1].EdgesList = {2};
 
 // We then define a Threshold field, which uses the return value of
 // the Attractor Field[1] in order to define a simple change in
@@ -89,5 +89,6 @@ Field[7] = Min;
 Field[7].FieldsList = {2, 3, 5, 6};
 Background Field = 7;
 
-// Don't extend the elements sizes from the boundary inside the domain
-Mesh.CharacteristicLengthExtendFromBoundary = 0;
+// If the boundary mesh size was too small, we could ask not to extend the
+// elements sizes from the boundary inside the domain:
+// Mesh.CharacteristicLengthExtendFromBoundary = 0;

tutorial/t11.geo

@@ -44,5 +44,4 @@ Recombine Surface{100};
 // "Delaunay for quads" (DelQuad) meshing algorithm: DelQuad is a
 // triangulation algorithm that enables to create right triangles
 // almost everywhere. Uncomment the following line to try DelQuad:
-
-Mesh.Algorithm = 8; // DelQuad (experimental)
+// Mesh.Algorithm = 8;

tutorial/t3.geo

@@ -58,13 +58,12 @@ out[] = Extrude { {-2*h,0,0}, {1,0,0} , {0,0.15,0.25} , angle * Pi / 180 } {
 Physical Volume(101) = {1, 2, out[1]};
 
 // Let us now change some options... Since all interactive options are
-// accessible in Gmsh's scripting language, we can for example define
-// a global characteristic length factor or redefine some colors
-// directly in the input file:
+// accessible in Gmsh's scripting language, we can for example make point tags
+// visible or redefine some colors directly in the input file:
 
-Mesh.CharacteristicLengthFactor = 4;
-General.Color.Text = White;
+Geometry.PointNumbers = 1;
 Geometry.Color.Points = Orange;
+General.Color.Text = White;
 Mesh.Color.Points = {255,0,0};
 
 // Note that all colors can be defined literally or numerically, i.e.