Add some spaces to the INCLUDE_DIRECTORIES documentation.

Source/cmMakefile.cxx

@@ -3986,20 +3986,20 @@ void cmMakefile::DefineProperties(cmake *cm)
     ("INCLUDE_DIRECTORIES", cmProperty::DIRECTORY,
      "List of preprocessor include file search directories.",
      "This property specifies the list of directories given "
-     "so far to the include_directories command. "
-     "This property exists on directories and targets. "
+     "so far to the include_directories command.  "
+     "This property exists on directories and targets.  "
      "In addition to accepting values from the include_directories "
      "command, values may be set directly on any directory or any "
-     "target using the set_property command. "
+     "target using the set_property command.  "
      "A target gets its initial value for this property from the value "
-     "of the directory property. "
+     "of the directory property.  "
      "A directory gets its initial value from its parent directory if "
-     "it has one. "
+     "it has one.  "
      "Both directory and target property values are adjusted by calls "
      "to the include_directories command."
      "\n"
      "The target property values are used by the generators to set "
-     "the include paths for the compiler. "
+     "the include paths for the compiler.  "
      "See also the include_directories command.");
 
   cm->DefineProperty