Update bilby/gw/detector/interferometer.py

Co-authored-by: Colm Talbot <talbotcolm@gmail.com>

Author: GregoryAshton

bilby/gw/detector/interferometer.py

@@ -603,7 +603,9 @@ def inner_product(self, signal):
 
         Returns
         =======
-        float: The optimal signal to noise ratio possible squared
+        float:
+            The noise-weighted inner product between the passed signal
+            and the data stored in the :code:`Interferometer`.
         """
         whitened_signal = self.whiten_frequency_series(signal)
         whitened_data = self.whitened_frequency_domain_strain