Help: Fix minor inaccuracies of what BUILD_RPATH_USE_ORIGIN affects

Help/prop_tgt/BUILD_RPATH_USE_ORIGIN.rst

@@ -8,14 +8,14 @@ This property is initialized by the value of the variable
 
 On platforms that support runtime paths (``RPATH``) with the
 ``$ORIGIN`` token, setting this property to ``TRUE`` enables relative
-paths in the build ``RPATH`` for executables that point to shared
-libraries in the same build tree.
+paths in the build ``RPATH`` for executables and shared libraries that
+point to shared libraries in the same build tree.
 
-Normally the build ``RPATH`` of an executable contains absolute paths
-to the directory of shared libraries. Directories contained within the
-build tree can be made relative to enable relocatable builds and to
-help achieving reproducible builds by omitting the build directory
-from the build environment.
+Normally the build ``RPATH`` of a binary contains absolute paths
+to the directory of each shared library it links to.  The ``RPATH``
+entries for directories contained within the build tree can be made
+relative to enable relocatable builds and to help achieve reproducible
+builds by omitting the build directory from the build environment.
 
 This property has no effect on platforms that do not support the
 ``$ORIGIN`` token in ``RPATH``, or when the :variable:`CMAKE_SKIP_RPATH`