Changed a docstring

bilby/gw/detector/interferometer.py

@@ -346,8 +346,8 @@ class Interferometer(object):
         Note
         -------
         if your signal takes a substantial amount of time to generate, or
-        you experience buggy behaviour. It is preferable to provide the
-        injection_polarizations directly.
+        you experience buggy behaviour. It is preferable to use the
+        inject_signal_from_waveform_polarizations() method.
 
         Returns
         -------