docs/specifications/dirnodes.rst: fix references to mutable.rst. refs #1225

diff --git a/docs/specifications/dirnodes.rst b/docs/specifications/dirnodes.rst
index 129e4997730301e977f04455cd47e2ba62dafab4..ec6bd2352d16a2186536aaa956fed2167744a6be 100644 (file)
--- a/docs/specifications/dirnodes.rst
+++ b/docs/specifications/dirnodes.rst
@@ -100,7 +100,7 @@ just a special way of interpreting the contents of a specific mutable file.
 Earlier releases used a "vdrive server": this server was abolished in the
 v0.7.0 release.
 
-For details of how mutable files work, please see "mutable.txt" in this
+For details of how mutable files work, please see `<mutable.rst>`_ in this
 directory.
 
 For releases since v0.7.0, we achieve most of our desired properties. The
@@ -128,7 +128,7 @@ Dirnode secret values
 
 As mentioned before, dirnodes are simply a special way to interpret the
 contents of a mutable file, so the secret keys and capability strings
-described in "mutable.txt" are all the same. Each dirnode contains an RSA
+described in `<mutable.rst>`_ are all the same. Each dirnode contains an RSA
 public/private keypair, and the holder of the "write capability" will be able
 to retrieve the private key (as well as the AES encryption key used for the
 data itself). The holder of the "read capability" will be able to obtain the