Fix markup in examples

docs/examples.rst

@@ -120,7 +120,7 @@ If the value does not pass the validator's standards, it just raises an appropri
       ...
    ValueError: 'x' has to be smaller than 5!
 
-``attrs`` won't intercept your changes to those attributes but you can always call :func:``attr.validate`` on any instance to verify, that it's still valid:
+``attrs`` won't intercept your changes to those attributes but you can always call :func:`attr.validate` on any instance to verify, that it's still valid:
 
 .. doctest::