Remove mention of SparseDiffTools in AbstractColoringAlgorithm

Author: gdalle

src/sparse.jl

@@ -47,7 +47,7 @@ hessian_sparsity(f, x, ::NoSparsityDetector) = trues(length(x), length(x))
 """
     AbstractColoringAlgorithm
 
-Abstract supertype for Jacobian/Hessian coloring algorithms, defined for example in [SparseDiffTools.jl](https://github.com/JuliaDiff/SparseDiffTools.jl).
+Abstract supertype for Jacobian/Hessian coloring algorithms.
 
 # Required methods
 
@@ -59,11 +59,7 @@ Abstract supertype for Jacobian/Hessian coloring algorithms, defined for example
 
 The terminology and definitions are taken from the following paper:
 
-> "What Color Is Your Jacobian? Graph Coloring for Computing Derivatives"
-> 
-> Assefaw Hadish Gebremedhin, Fredrik Manne, and Alex Pothen (2005)
-> 
-> https://epubs.siam.org/doi/10.1137/S0036144504444711
+> [_What Color Is Your Jacobian? Graph Coloring for Computing Derivatives_](https://epubs.siam.org/doi/10.1137/S0036144504444711), Assefaw Hadish Gebremedhin, Fredrik Manne, and Alex Pothen (2005)
 """
 abstract type AbstractColoringAlgorithm end