small fixes

tutorial/t2.geo

@@ -12,15 +12,15 @@
 
 Include "t1.geo";
 
-// We can then add new points and lines and surfaces in the same way
-// as we did in `t1.geo':
+// We can then add new points and lines in the same way as we did in
+// `t1.geo':
 
 Point(5) = {0, .4, 0, lc};
 Line(5) = {4, 5};
 
 // But Gmsh also provides tools to tranform (translate, rotate, etc.)
 // elementary entities or copies of elementary entities. For example,
-// the point 3 can be moved by 0.05 units on the left with:
+// the point 3 can be moved by 0.05 units to the left with:
 
 Translate {-0.05,0,0} { Point{3}; }
 
@@ -46,8 +46,8 @@ Plane Surface(11) = {10};
 Extrude Surface { 11, {0, 0, h} };
 
 // All these geometrical transformations automatically generate new
-// elementary entities. The following command permits to specify
-// manually a characteristic length for some of the new points:
+// elementary entities. The following command permits to manually
+// specify a characteristic length for some of the new points:
 
 Characteristic Length {6, 22, 2, 3, 16, 12} = lc * 2;
 

tutorial/t3.geo

@@ -69,16 +69,16 @@ General.TranslationX = -0.2;
 
 // Note that all colors can be defined literally or numerically, i.e.
 // `General.Color.Background = Red' is equivalent to
-// `General.Color.Background = {255,0,0}'; and that, as with
+// `General.Color.Background = {255,0,0}'; and also note that, as with
 // user-defined variables, the options can be used either as right or
-// left hand sides, so that the following command will set the
-// surface color to the same color as the points:
+// left hand sides, so that the following command will set the surface
+// color to the same color as the points:
 
 Geometry.Color.Surfaces = Geometry.Color.Points;
 
 // You can click on the `?'  button in the status bar of the graphic
 // window to see the current values of all options. To save all the
-// options to a file, you can use the `File->Save as->Gmsh options'
+// options in a file, you can use the `File->Save as->Gmsh options'
 // menu. To save the current options as the default options for all
 // future Gmsh sessions, you should use the `Tools->Options->Save'
 // button.

tutorial/t4.geo

@@ -58,8 +58,7 @@ Line(2)  = {17,16};
 // Since not all curves are straight lines, Gmsh provides many other
 // curve primitives: splines, B-splines, circle arcs, ellipse arcs,
 // etc. Here we define a new circle arc, starting at point 14 and
-// ending at point 16, and with the circle's center being the point
-// 15:
+// ending at point 16, with the circle's center being the point 15:
 
 Circle(3) = {14,15,16};
  
@@ -94,9 +93,9 @@ Plane Surface(22) = {21};
 Line Loop(23) = {11,-12,13,14,1,2,-3,4,5,6,7,-8,9,10};
 Plane Surface(24) = {23,21};
 
-// Finally, we can add some comments by simply embedding a
-// post-processing view containg some strings, and change the color of
-// some mesh entities:
+// Finally, we can add some comments by embedding a post-processing
+// view containing some strings, and change the color of some mesh
+// entities:
 
 View "comments" {
   // 10 pixels from the left and 15 pixels from the top of the graphic