Minor typo fixes (#2148)

Author: blegat

src/Bridges/Constraint/bridges/norm_one.jl

@@ -186,7 +186,7 @@ function MOI.get(
     bridge::NormOneBridge,
 )
     nn_primal = MOI.get(model, attr, bridge.nn_index)
-    if nn_primal == nothing
+    if nn_primal === nothing
         return nothing
     end
     t = (nn_primal[1] + sum(nn_primal)) / 2

src/Bridges/Constraint/bridges/quad_to_soc.jl

@@ -237,7 +237,7 @@ function MOI.get(
     # `(Ux)'Ux / 2 - (-a'x + ub) + ub`
     # Otherwise, `Q = -U'U` and we have the value of
     # `Ux` and `a'x - ub`, so we get it with
-    # `-(Ux)'Ux / 2 + (a'x - lb) + ub`
+    # `-(Ux)'Ux / 2 + (a'x - lb) + lb`
     soc = MOI.get(model, attr, bridge.soc)
     if soc === nothing
         return nothing

src/Bridges/Constraint/bridges/soc_to_psd.jl

@@ -274,5 +274,5 @@ function MOI.Bridges.inverse_adjoint_map_function(
     t, u, x = func[1], func[2], func[3:end]
     Q = (u / (2 * (x' * x))) * (x * x')
     M = [t x'/2; x/2 Q]
-    return [M[i, j] for j in 1:size(M, 2) for i in 1:j]
+    return [M[i, j] for j in axes(M, 2) for i in 1:j]
 end

src/Nonlinear/operators.jl

@@ -617,11 +617,11 @@ function eval_multivariate_gradient(
         else
             total = prod(x)
             if iszero(total)
-                for i in 1:length(x)
-                    g[i] = prod(x[j] for j in 1:length(x) if i != j)
+                for i in eachindex(x)
+                    g[i] = prod(x[j] for j in eachindex(x) if i != j)
                 end
             else
-                for i in 1:length(x)
+                for i in eachindex(x)
                     g[i] = total / x[i]
                 end
             end