Enhance comments in compute_sparse_sqrt function

Added comments to clarify the purpose of the try-catch block in compute_sparse_sqrt function.

Author: odow

src/Bridges/Constraint/bridges/QuadtoSOCBridge.jl

@@ -80,6 +80,13 @@ function compute_sparse_sqrt_fallback(Q, ::F, ::S) where {F,S}
 end
 
 function compute_sparse_sqrt(Q, func, set)
+    # There's a big try-catch here because `cholesky` can fail even if
+    # `check = false`. As one example, it currently (v1.12) fails with
+    # `BigFloat`. Similarly, we want to guard against errors in
+    # `compute_sparse_sqrt_fallback`.
+    #
+    # The try-catch isn't a performance concern because the alternative is not
+    # being able to reformulate the problem.
     try
         factor = LinearAlgebra.cholesky(Q; check = false)
         if !LinearAlgebra.issuccess(factor)