Documentation/process/howto.rst: add a missing cross-reference

Add a missing cross-reference from Documentation/process/howto.rst
to Documentation/admin-guide/README.rst.

Signed-off-by: Michael Rodin <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
diff --git a/Documentation/process/howto.rst b/Documentation/process/howto.rst
index 3df5581..130bf0f 100644
--- a/Documentation/process/howto.rst
+++ b/Documentation/process/howto.rst
@@ -85,7 +85,7 @@
 Here is a list of files that are in the kernel source tree that are
 required reading:
 
-  README
+  :ref:`Documentation/admin-guide/README.rst <readme>`
     This file gives a short background on the Linux kernel and describes
     what is necessary to do to configure and build the kernel.  People
     who are new to the kernel should start here.