CookBook: no space before colon typo

Documentation/Cookbook/rst/Installation_Linux.txt

Documentation/Cookbook/rst/Installation_Macx.txt

Documentation/Cookbook/rst/Installation_Windows.txt

Documentation/Cookbook/rst/Monteverdi.rst

Documentation/Cookbook/rst/OTB-Applications.rst

Documentation/Cookbook/rst/recipes/bandmathx.rst

Documentation/Cookbook/rst/recipes/improc.rst

Documentation/Cookbook/rst/recipes/optpreproc.rst

Documentation/Cookbook/rst/recipes/pbclassif.rst

Documentation/Cookbook/rst/recipes/residual_registration.rst

Documentation/Cookbook/rst/recipes/sarprocessing.rst

Documentation/Cookbook/rst/recipes/stereo.rst