harmonise docstrings with determinist parameters

include/evalhyd/evalp.hpp

@@ -22,16 +22,16 @@ namespace evalhyd
     /// :Parameters:
     ///
     ///    q_obs: ``xt::xtensor<double, 2>``
-    ///       Streamflow observations. Time steps with missing observation
-    ///       must be assigned `NAN` values. Those time steps will be pairwise
-    ///       ignored in the observations and the predictions before the
+    ///       Streamflow observations. Time steps with missing observations
+    ///       must be assigned `NAN` values. Those time steps will be ignored
+    ///       both in the observations and the predictions before the
     ///       *metrics* are computed.
     ///       shape: (sites, time)
     ///
     ///    q_prd: ``xt::xtensor<double, 4>``
-    ///       Streamflow predictions. Time steps with missing prediction
-    ///       must be assigned `NAN` values. Those time steps will be pairwise
-    ///       ignored in the observations and the predictions before the
+    ///       Streamflow predictions. Time steps with missing predictions
+    ///       must be assigned `NAN` values. Those time steps will be ignored
+    ///       both in the observations and the predictions before the
     ///       *metrics* are computed.
     ///       shape: (sites, lead times, members, time)
     ///