DOC: Patch for spelling error in 5.6.1 (contribute by sebastic)

Modules/Applications/AppProjection/app/otbSuperimpose.cxx

@@ -131,7 +131,7 @@ private:
     SetParameterDescription("interpolator.bco", "Bicubic interpolation leads to very good image quality but is slow.");
 
     AddParameter(ParameterType_Radius, "interpolator.bco.radius", "Radius for bicubic interpolation");
-    SetParameterDescription("interpolator.bco.radius","This parameter allows controling the size of the bicubic interpolation filter. If the target pixel size is higher than the input pixel size, increasing this parameter will reduce aliasing artefacts.");
+    SetParameterDescription("interpolator.bco.radius","This parameter allows controlling the size of the bicubic interpolation filter. If the target pixel size is higher than the input pixel size, increasing this parameter will reduce aliasing artefacts.");
     SetDefaultParameterInt("interpolator.bco.radius", 2);
 
     AddChoice("interpolator.nn",     "Nearest Neighbor interpolation");

Modules/IO/ImageIO/include/otbImageFileReader.h

@@ -73,7 +73,7 @@ public:
  * It interfaces with an ImageIO class to read in the data and
  * supports streaming (partial reading) if the source dataset does so.
  *
- * ImageFileReader supports extended filenames, which allow controling
+ * ImageFileReader supports extended filenames, which allow controlling
  * how the source dataset is read. See
  * http://wiki.orfeo-toolbox.org/index.php/ExtendedFileName for more
  * information.

Modules/IO/ImageIO/include/otbImageFileWriter.h

@@ -43,7 +43,7 @@ namespace otb
  * ImageFileWriter will write directly the streaming buffer in the image file, so
  * that the output image never needs to be completely allocated
  *
- * ImageFileWriter supports extended filenames, which allow controling
+ * ImageFileWriter supports extended filenames, which allow controlling
  * some properties of the output file. See
  * http://wiki.orfeo-toolbox.org/index.php/ExtendedFileName for more
  * information.