Fixed a typo in conventions.rst

fredrhen · fredrhen · commit ffee2acf1920 · 2022-10-07T11:28:19.000+02:00
diff --git a/doc/conventions.rst b/doc/conventions.rst
@@ -29,7 +29,7 @@ of linear time-invariant (LTI) systems:
 
 where u is the input, y is the output, and x is the state.
 
-To create a state space system, use the :fun:`ss` function:
+To create a state space system, use the :func:`ss` function:
 
   sys = ct.ss(A, B, C, D)
 
