docs: fix link to mutable.rst. Thanks to TimothyA for noticing the broken link

diff --git a/docs/configuration.rst b/docs/configuration.rst
index 20a0fbfcfc70ad055cdf0c911f8bac115f03a34d..c458836df9b0d5f7c1bad8bc5688a1555649c24c 100644 (file)
--- a/docs/configuration.rst
+++ b/docs/configuration.rst
@@ -375,8 +375,8 @@ Client Configuration
     controlled by this parameter and will always use SDMF. We may revisit
     this decision in future versions of Tahoe-LAFS.
 
-    See `<frontends/specifications/mutable.rst>`_ for details about mutable
-    file formats.
+    See `<specifications/mutable.rst>`_ for details about mutable file
+    formats.
 
 Frontend Configuration
 ======================