Star and acyclic coloring -- enhanced edition

Author: amontoison

docs/src/dev.md

@@ -23,7 +23,6 @@ SparseMatrixColorings.bidirectional_pattern
 
 ```@docs
 SparseMatrixColorings.partial_distance2_coloring
-SparseMatrixColorings.symmetric_coefficient
 SparseMatrixColorings.star_coloring
 SparseMatrixColorings.acyclic_coloring
 SparseMatrixColorings.group_by_color