update docstrings

pypeit/images/buildimage.py

@@ -222,6 +222,9 @@ def buildimage_fromlist(spectrograph, det, frame_par, file_list, bias=None, bpm=
             Flag processed image will be a mosaic of multiple detectors.  By
             default, this is determined by the format of ``det`` and whether or
             not this is a bias or dark frame.  *Only used for testing purposes.*
+        manual_spat_flexure (:obj:`list`, `numpy.ndarray`_, optional):
+            A list of the spatial flexures for each image in file_list.  This is only
+            used to manually correct the slit traces for spatial flexure of each image.
         calib_dir (:obj:`str`, `Path`_, optional):
             The directory for processed calibration files.  Required for
             elements of :attr:`frame_image_classes`, ignored otherwise.

pypeit/images/rawimage.py

@@ -519,6 +519,9 @@ def process(self, par, bpm=None, scattlight=None, flatimages=None, bias=None, sl
                 mosaic.  If flats or slits are provided (and used), this *must*
                 be true because these objects are always defined in the mosaic
                 frame.
+            manual_spat_flexure (:obj:`float`, optional):
+                The spatial flexure of the image. This is only set if the user wishes to
+                manually correct the slit traces of this image for spatial flexure.
             debug (:obj:`bool`, optional):
                 Run in debug mode.