fix doc strings

bilby/gw/detector/__init__.py

@@ -290,7 +290,7 @@ def load_data_by_channel_name(
         channel_name, start_time, segment_duration, psd_duration, psd_start_time,
         sampling_frequency=4096, roll_off=0.2,
         overlap=0, outdir=None):
-    """ Helper routine to generate an interferometer from a cache file
+    """ Helper routine to generate an interferometer from a channel name
 
     Parameters
     ----------

bilby/gw/detector/psd.py

@@ -145,7 +145,7 @@ class PowerSpectralDensity(object):
                           fft_length=4, sampling_frequency=4096, roll_off=0.2,
                           overlap=0, name=None, outdir=None,
                           analysis_segment_start_time=None):
-        """ Generate power spectral density from a frame file
+        """ Generate power spectral density from a given channel name
 
         Parameters
         ----------