re-order for alphabetical

Author: kbarnhart

docs/source/umami.calculations.rst

@@ -12,8 +12,8 @@ Calculations for Metrics or Residuals
    umami.calculations.metric.chi_intercept_gradient
    umami.calculations.metric.count_equal
    umami.calculations.metric.hypsometric_integral
-   umami.calculations.metric.watershed_aggregation
    umami.calculations.metric.mask_aggregation
+   umami.calculations.metric.watershed_aggregation
 
 Calculations for Residuals only
 -------------------------------