Fix spelling mistakes in tkinter.py (#1716)

Ran the docstrings through spell checker, and fixed spelling issues.

Lib/tkinter/__init__.py

@@ -1004,7 +1004,7 @@ def winfo_ismapped(self):
         return self.tk.getint(
             self.tk.call('winfo', 'ismapped', self._w))
     def winfo_manager(self):
-        """Return the window mananger name for this widget."""
+        """Return the window manager name for this widget."""
         return self.tk.call('winfo', 'manager', self._w)
     def winfo_name(self):
         """Return the name of this widget."""
@@ -1679,7 +1679,7 @@ def image_names(self):
         return self.tk.splitlist(self.tk.call('image', 'names'))
 
     def image_types(self):
-        """Return a list of all available image types (e.g. phote bitmap)."""
+        """Return a list of all available image types (e.g. photo bitmap)."""
         return self.tk.splitlist(self.tk.call('image', 'types'))
 
 
@@ -1818,7 +1818,7 @@ def wm_focusmodel(self, model=None):
         return self.tk.call('wm', 'focusmodel', self._w, model)
     focusmodel = wm_focusmodel
     def wm_forget(self, window): # new in Tk 8.5
-        """The window will be unmappend from the screen and will no longer
+        """The window will be unmapped from the screen and will no longer
         be managed by wm. toplevel windows will be treated like frame
         windows once they are no longer managed by wm, however, the menu
         option configuration will be remembered and the menus will return
@@ -2527,7 +2527,7 @@ def find_closest(self, x, y, halo=None, start=None):
         """Return item which is closest to pixel at X, Y.
         If several match take the top-most.
         All items closer than HALO are considered overlapping (all are
-        closests). If START is specified the next below this tag is taken."""
+        closest). If START is specified the next below this tag is taken."""
         return self.find('closest', x, y, halo, start)
     def find_enclosed(self, x1, y1, x2, y2):
         """Return all items in rectangle defined
@@ -2587,7 +2587,7 @@ def postscript(self, cnf={}, **kw):
         """Print the contents of the canvas to a postscript
         file. Valid options: colormap, colormode, file, fontmap,
         height, pageanchor, pageheight, pagewidth, pagex, pagey,
-        rotate, witdh, x, y."""
+        rotate, width, x, y."""
         return self.tk.call((self._w, 'postscript') +
                     self._options(cnf, kw))
     def tag_raise(self, *args):
@@ -3522,7 +3522,7 @@ def height(self):
         return self.tk.getint(
             self.tk.call('image', 'height', self.name))
     def type(self):
-        """Return the type of the imgage, e.g. "photo" or "bitmap"."""
+        """Return the type of the image, e.g. "photo" or "bitmap"."""
         return self.tk.call('image', 'type', self.name)
     def width(self):
         """Return the width of the image."""