add missing requirements in docstring for KGE

src/determinist/evaluator.hpp

@@ -252,9 +252,15 @@ namespace evalhyd
         // \require q_obs:
         //     Streamflow observations.
         //     shape: ({1, ...}, time)
+        // \require mean_obs:
+        //     Mean observed streamflow.
+        //     shape: ({1, ...}, 1)
         // \require q_prd:
         //     Streamflow predictions.
         //     shape: ({1+, ...}, time)
+        // \require mean_prd:
+        //     Mean predicted streamflow.
+        //     shape: ({1+, ...}, 1)
         // \require r_pearson:
         //     Pearson correlation coefficients.
         //     shape: ({1+, ...}, time)