Update cbc_analysis.rst after adding svd-sort option

The request updates the offline workflow docs after the the addition of the option sort-by in the config file.

I also added a mention to the dtdphi file in the docs. In a future update, we may consider to include a dtdphi file in the example bns analysis.

doc/source/cbc_analysis.rst

@@ -353,6 +353,7 @@ Section: SVD
     svd:
       f-low: 20.0
       num-chi-bins: 1
+      sort-by: mchirp
       approximant:
         - 0:1000:TaylorF2
       tolerance: 0.9999
@@ -375,6 +376,8 @@ procedure; specifically, sets the number of effective spin parameter bins to use
 in the chirp-mass / effective spin binning procedure described in Sec. IID and
 Fig. 6 of [1].
 
+``sort-by`` selects the template sort column. This controls how to bin the bank in sub-banks suitable for the svd decomposition.
+
 ``approximant`` specifies the waveform approximant that should be used along
 with chirp mass bounds to use that approximant in. 0:1000:TaylorF2 means use the
 TaylorF2 approximant for waveforms from systems with chirp-masses between 0 and
@@ -551,6 +554,10 @@ model is used to weight templates appropriately when assigning ranking
 statistics based on our understanding of the astrophysical distribution of
 signals. Users will not typically change this option.
 
+An optional ``dtdphi-file`` can be provided here. If not given, a default model
+(included in the standard installation) will be used. The dtdph file will specify a probability distribution function for the probability of measuring a given time shift and 
+phase shift in a two detector observation. It enters in the ranking statistics.
+
 Section: Rank
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