Fix new target commands documentation.

The target_include_directories and target_compile_defintions commands
accepted targets as arguments until commit f6b16d4b (Don't allow
targets args in the new target commands., 2013-01-29). This followed
from discussion on the mailing list (target_include_directories() accepts
only absolute paths ?, 2013-01-28):

 http://thread.gmane.org/gmane.comp.programming.tools.cmake.devel/5925/focus=5948

 http://public.kitware.com/pipermail/cmake-developers/2013-January/006301.html

It was also decided to allow relative paths in target_include_directories().

Source/cmTargetCompileDefinitionsCommand.h

@@ -56,8 +56,7 @@ public:
       "  target_compile_definitions(<target> "
       "<INTERFACE|PUBLIC|PRIVATE> [items1...]\n"
       "    [<INTERFACE|PUBLIC|PRIVATE> [items2...] ...])\n"
-      "Specify compile definitions or targets to use when compiling a given "
-      "target.  "
+      "Specify compile definitions to use when compiling a given target.  "
       "The named <target> must have been created by a command such as "
       "add_executable or add_library and must not be an IMPORTED target.  "
       "The INTERFACE, PUBLIC and PRIVATE keywords are required to specify "
@@ -65,8 +64,7 @@ public:
       "populate the COMPILE_DEFINITIONS property of <target>.  PUBLIC and "
       "INTERFACE items will populate the INTERFACE_COMPILE_DEFINITIONS "
       "property of <target>.   "
-      "The non-scope arguments specify compile definitions or targets to use "
-      "INTERFACE_COMPILE_DEFINITIONS from.  "
+      "The following arguments specify compile definitions.  "
       "Repeated calls for the same <target> append items in the order called."
       "\n"
       "Arguments to target_compile_definitions may use \"generator "

Source/cmTargetIncludeDirectoriesCommand.h

@@ -68,9 +68,8 @@ public:
       "populate the INCLUDE_DIRECTORIES property of <target>.  PUBLIC and "
       "INTERFACE items will populate the INTERFACE_INCLUDE_DIRECTORIES "
       "property of <target>.   "
-      "The non-scope arguments specify either include directories or targets "
-      "to use INTERFACE_INCLUDE_DIRECTORIES from.  Any specified include "
-      "directories must be absolute paths, not relative paths.  "
+      "The following arguments specify include directories.  Specified "
+      "include directories may be absolute paths or relative paths.  "
       "Repeated calls for the same <target> append items in the order called."
       "\n"
       "Arguments to target_include_directories may use \"generator "