Fix spelling errors. (#1920)

* postion -> position

Backport of #1916.

Co-authored-by: Bas Couwenberg <sebastic@xs4all.nl>

gui/wxpython/nviz/tools.py

@@ -5719,7 +5719,7 @@ class NvizToolWindow(FN.FlatNotebook):
 
 class PositionWindow(Window):
     """Abstract position control window, see subclasses
-    ViewPostionWindow and LightPositionWindow"""
+    ViewPositionWindow and LightPositionWindow"""
 
     def __init__(self, parent, mapwindow, id=wx.ID_ANY,
                  **kwargs):

imagery/i.ortho.photo/lib/orthoref.c

@@ -277,7 +277,7 @@ int I_compute_ortho_equations(struct Ortho_Control_Points *cpz,
 	WT1.x[5][5] = (Q1 / (kappa_var * kappa_var));
     }
     else {
-	G_warning(_("Camera postion not available"));
+	G_warning(_("Camera position not available"));
 #ifdef DEBUG
 	fclose(debug);
 #endif
@@ -547,7 +547,7 @@ int I_compute_ortho_equations(struct Ortho_Control_Points *cpz,
 #endif
 
     }  /* end ITERATION loop */
-    G_verbose_message("%d iterations to refine camera postion", iter);
+    G_verbose_message("%d iterations to refine camera position", iter);
 
     /* This is the solution */
     *XC = epsilon.x[0][0];