add docstring for parameters in is_totally_unimodular

src/sage/matrix/matrix_cmr_sparse.pyx

@@ -2197,6 +2197,20 @@ cdef class Matrix_cmr_chr_sparse(Matrix_cmr_sparse):
  INPUT:
 
  - ``certificate``: ``False`` or ``True``
+ If ``True``, then return a :class:`DecompositionNode`
+ if the linear matroid of ``self`` over `\GF{2}` is regular;
+ If not, NotImplemented.
+
+ - ``stop_when_irregular`` -- boolean (default: ``True``)
+ Whether to stop decomposing once irregularity is determined.
+
+ For a description of other parameters, see :meth:`_set_cmr_seymour_parameters`
+
+ - ``row_keys`` -- a finite or enumerated family of arbitrary objects
+ that index the rows of the matrix
+
+ - ``column_keys`` -- a finite or enumerated family of arbitrary objects
+ that index the columns of the matrix
 
  EXAMPLES::
 
@@ -2376,6 +2390,20 @@ cdef class Matrix_cmr_chr_sparse(Matrix_cmr_sparse):
  INPUT:
 
  - ``certificate``: ``False`` or ``True``
+ If ``True``, then return
+ a :class:`DecompositionNode` if ``self`` is totally unimodular;
+ a submatrix with determinant not in `\{0, \pm1\}` if not.
+
+ - ``stop_when_nonTU`` -- boolean (default: ``True``)
+ Whether to stop decomposing once not TU is determined.
+
+ For a description of other parameters, see :meth:`_set_cmr_seymour_parameters`
+
+ - ``row_keys`` -- a finite or enumerated family of arbitrary objects
+ that index the rows of the matrix
+
+ - ``column_keys`` -- a finite or enumerated family of arbitrary objects
+ that index the columns of the matrix
 
  EXAMPLES::