Fixed a few typos.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@6837 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

documentation/src/osissues.dox

@@ -274,7 +274,7 @@ An example:
 void MyWindow::show() {
   if (shown()) {Fl_Window::show(); return;}  // you must do this!
   fl_open_display();	// necessary if this is first window
-  // we only calcualte the necessary visual colormap once:
+  // we only calculate the necessary visual colormap once:
   static XVisualInfo *visual;
   static Colormap colormap;
   if (!visual) {

documentation/src/subclassing.dox

@@ -14,11 +14,10 @@ typically Fl_Widget for controls and Fl_Group for composite widgets.
 A control widget typically interacts with the user to receive and/or
 display a value of some sort. 
 
-A composite widget widget holds a list of child widgets and handles moving,
-sizing, showing, or hiding them as needed. Fl_Group is the
-main composite widget widget class in FLTK, and all of the other composite
-widgets (Fl_Pack, Fl_Scroll, Fl_Tabs,
-Fl_Tile, and Fl_Window) are subclasses of it. 
+A composite widget holds a list of child widgets and handles moving,
+sizing, showing, or hiding them as needed. Fl_Group is the main
+composite widget class in FLTK, and all of the other composite widgets
+(Fl_Pack, Fl_Scroll, Fl_Tabs, Fl_Tile, and Fl_Window) are subclasses of it. 
 
 You can also subclass other existing widgets to provide a different
 look or user-interface. For example, the button widgets are all
@@ -518,7 +517,6 @@ differences:
 -# Fl_Window is a subclass of Fl_Group so
    <I>make sure your constructor calls</I> \p end()
    unless you actually want children added to your window.
-
 -# When handling events and drawing, the upper-left corner is at
    0,0, not <tt>x(),y()</tt> as in other Fl_Widget's.
    For instance, to draw a box around the widget, call