Merge pull request #3254 from MRtrix3/shconv_fix_docs

shconv: Fix duplicate DESCRIPTION

Author: Lestropie

cmd/shconv.cpp

@@ -44,9 +44,6 @@ void usage ()
        "along the 5th dimension."
     + Math::SH::encoding_description;
 
-  DESCRIPTION
-  + Math::SH::encoding_description;
-
   ARGUMENTS
     + Argument ("odf response", "pairs of input ODF image and corresponding responses").allow_multiple()
     + Argument ("SH_out", "the output spherical harmonics coefficients image.").type_image_out ();

docs/reference/commands/shconv.rst

@@ -30,9 +30,6 @@ If the responses are multi-shell (with one line of coefficients per shell), the
 The spherical harmonic coefficients are stored according the conventions described the main documentation, which can be found at the following link:  |br|
 https://mrtrix.readthedocs.io/en/3.0.8/concepts/spherical_harmonics.html
 
-The spherical harmonic coefficients are stored according the conventions described the main documentation, which can be found at the following link:  |br|
-https://mrtrix.readthedocs.io/en/3.0.8/concepts/spherical_harmonics.html
-
 Options
 -------