clarify docstrings on recently improved masking conditions

include/evalhyd/evald.hpp

@@ -104,11 +104,11 @@ namespace evalhyd
     ///    m_cdt: ``xt::xtensor<std::array<char, 32>, N>``, optional
     ///       Masking conditions to use to generate temporal subsets. Each
     ///       condition consists in a string and can be specified on observed
-    ///       streamflow values, or on time indices. If provided in combination
-    ///       with *t_msk*, the latter takes precedence. If not provided and
-    ///       neither is *t_msk*, no subset is performed. If provided, there
-    ///       must be as many conditions as there are time series of
-    ///       observations.
+    ///       streamflow values/statistics (mean, median, quantile), or on time
+    ///       indices. If provided in combination with *t_msk*, the latter takes
+    ///       precedence. If not provided and neither is *t_msk*, no subset is
+    ///       performed. If provided, there must be as many conditions as there
+    ///       are time series of observations.
     ///       shape: ({... ,} 1)
     ///
     ///       .. seealso:: :doc:`../../functionalities/conditional-masking`

include/evalhyd/evalp.hpp

@@ -58,13 +58,13 @@ namespace evalhyd
     ///
     ///    m_cdt: ``xt::xtensor<std::array<char, 32>, 2>``, optional
     ///       Masking conditions to use to generate temporal subsets. Each
-    ///       condition consists in a string and can be specified on observed
-    ///       or predicted streamflow values, or on time indices. If provided
-    ///       in combination with *t_msk*, the latter takes precedence. If not
-    ///       provided and neither is *t_msk*, no subset is performed and only
-    ///       one set of metrics is returned corresponding to the whole time
-    ///       series. If provided, as many sets of metrics are returned as they
-    ///       are conditions provided.
+    ///       condition consists in a string and can be specified on
+    ///       observed/predicted streamflow values/statistics (mean, median,
+    ///       quantile), or on time indices. If provided in combination with
+    ///       *t_msk*, the latter takes precedence. If not provided and neither
+    ///       is *t_msk*, no subset is performed and only one set of metrics is
+    ///       returned corresponding to the whole time series. If provided, as
+    ///       many sets of metrics are returned as they are conditions provided.
     ///       shape: (sites, subsets)
     ///
     ///       .. seealso:: :doc:`../../functionalities/conditional-masking`