fix in doc

[makedoc]

CHANGES/v2.4.md

@@ -93,4 +93,4 @@ Fixes after alpha release:
     Notice that this is an experimental feature and is not fully validated yet. See \issue{244}.
   - When parsing constants, PLUMED uses lepton library. This allows to pass
     arguments such as `HEIGHT=exp(0.5)`.
-  - \ref CUSTOM function has been added as an alias to \ref MAXENT.
+  - \ref CUSTOM function has been added as an alias to \ref MATHEVAL .