Remove parentheses

Author: birgits

windpowerlib/wake_losses.py

@@ -79,8 +79,8 @@ def get_wind_efficiency_curve(curve_name='all'):
     -----
     The wind efficiency curves were generated in the "Dena Netzstudie" [1]_ and
     in the work of Kaspar Knorr [2]_. The mean wind efficiency curve is an
-    average curve from 12 wind farm distributed over Germany ([1]_) or
-    respectively an average from over 2000 wind farms in Germany ([2]_). Curves
+    average curve from 12 wind farm distributed over Germany [1]_ or
+    respectively an average from over 2000 wind farms in Germany [2]_. Curves
     with the appendix 'extreme' are wind efficiency curves of single wind farms
     that are extremely deviating from the respective mean wind efficiency
     curve. For more information see [1]_ and [2]_.