Fix layout of the CPack Bundle documentation

CPACK_BUNDLE_STARTUP_SCRIPT was in fact CPACK_BUNDLE_STARTUP_COMMAND in
the C++ code. The doc has been changed accordingly.

Modules/CPackBundle.cmake

@@ -4,33 +4,32 @@
 # - CPack Bundle generator (Mac OS X) specific options
 #
 # Installers built on Mac OS X using the Bundle generator use the
-# aforementioned DragNDrop variables, plus the following Bundle-specific
-# parameters:
+# aforementioned DragNDrop (CPACK_DMG_xxx) variables, plus
+# the following Bundle-specific parameters (CPACK_BUNDLE_xxx).
 ##end
 #
 ##variable
-#   CPACK_BUNDLE_NAME - The name of the generated bundle.  This
-#   appears in the OSX finder as the bundle name.  Required.
+#  CPACK_BUNDLE_NAME - The name of the generated bundle. This
+#  appears in the OSX finder as the bundle name. Required.
 ##end
 #
 ##variable
-#   CPACK_BUNDLE_PLIST - Path to an OSX plist file that will be used
-#   as the Info.plist for the generated bundle.  This assumes that
-#   the caller has generated or specified their own Info.plist file.
-#   Required.
+#  CPACK_BUNDLE_PLIST - Path to an OSX plist file that will be used
+#  for the generated bundle. This assumes that the caller has generated
+#  or specified their own Info.plist file. Required.
 ##end
 #
 ##variable
-#   CPACK_BUNDLE_ICON - Path to an OSX icns file that will be used as
-#   the icon for the generated bundle.  This is the icon that appears
-#   in the OSX finder for the bundle, and in the OSX dock when the
-#   bundle is opened.  Required.
+#  CPACK_BUNDLE_ICON - Path to an OSX icon file that will be used as
+#  the icon for the generated bundle. This is the icon that appears in the
+#  OSX finder for the bundle, and in the OSX dock when the bundle is opened.
+#  Required.
 ##end
 #
 ##variable
-#   CPACK_BUNDLE_STARTUP_SCRIPT - Path to an executable or script that
-#   will be run whenever an end-user double-clicks the generated bundle
-#   in the OSX Finder.  Optional.
+#  CPACK_BUNDLE_STARTUP_COMMAND - Path to a startup script. This is a path to
+#  an executable or script that will be run whenever an end-user double-clicks
+#  the generated bundle in the OSX Finder. Optional.
 ##end
 
 #=============================================================================