Remove a confusing sentence about pth files and which directories are searched
for them.

Closes issue #1431.  Thanks Giambattista Bloisi for the help.
diff --git a/Doc/install/index.rst b/Doc/install/index.rst
index c607eb9..aa2d915 100644
--- a/Doc/install/index.rst
+++ b/Doc/install/index.rst
@@ -621,8 +621,7 @@
 installing fixed versions of standard modules.)
 
 Paths can be absolute or relative, in which case they're relative to the
-directory containing the :file:`.pth` file.  Any directories added to the search
-path will be scanned in turn for :file:`.pth` files.  See the documentation of
+directory containing the :file:`.pth` file.  See the documentation of
 the :mod:`site` module for more information.
 
 A slightly less convenient way is to edit the :file:`site.py` file in Python's