doc: ReSTify Yama.txt

Adjusts for ReST markup and moves under LSM admin guide.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/security/yama/Kconfig b/security/yama/Kconfig
index 90c605e..96b2740 100644
--- a/security/yama/Kconfig
+++ b/security/yama/Kconfig
@@ -7,6 +7,7 @@
 	  system-wide security settings beyond regular Linux discretionary
 	  access controls. Currently available is ptrace scope restriction.
 	  Like capabilities, this security module stacks with other LSMs.
-	  Further information can be found in Documentation/security/Yama.txt.
+	  Further information can be found in
+	  Documentation/admin-guide/LSM/Yama.rst.
 
 	  If you are unsure how to answer this question, answer N.