clean up documentation

Source/cmSubdirCommand.h

@@ -62,13 +62,15 @@ public:
   virtual const char* GetFullDocumentation()
     {
     return
-      "  SUBDIRS(dir1 dir2 ...[EXCLUDE_FROM_ALL exclude_dir1 exclude_dir2 ...])\n"
+      "  SUBDIRS(dir1 dir2 ...[EXCLUDE_FROM_ALL exclude_dir1 exclude_dir2 ...] [PREORDER] )\n"
       "Add a list of subdirectories to the build. "
       "This will cause any CMakeLists.txt files in the sub directories "
-      "to be processed by CMake.  Any directories after the EXCLUDE_FROM_ALL marker "
+      "to be processed by CMake.  Any directories after the PREORDER flag "
+      "are traversed first by makefile builds, the PRORDER flag has no effect on IDE projects. " 
+      " Any directories after the EXCLUDE_FROM_ALL marker "
       "will not be included in the top level makefile or project file.  This is useful"
       " for having cmake create makefiles or projects for a set of examples in a project."
-      "You would want cmake to generated makefiles or project files for all the examples at"
+      " You would want cmake to generated makefiles or project files for all the examples at"
       " the same time, but you would not want them to show up in the top level project or be built"
       " each time make is run from the top.";
     }