Add missing comments

src/Numerics/LinearAlgebra/Complex/DiagonalMatrix.cs

@@ -177,6 +177,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex
         /// Creates a <see cref="Vector{T}"/> with a the given dimension.
         /// </summary>
         /// <param name="size">The size of the vector.</param>
+        /// <param name="fullyMutable">True if all fields must be mutable.</param>
         /// <returns>
         /// A <see cref="Vector{T}"/> with the given dimension.
         /// </returns>

src/Numerics/LinearAlgebra/Complex32/DiagonalMatrix.cs

@@ -177,6 +177,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32
         /// Creates a <see cref="Vector{T}"/> with a the given dimension.
         /// </summary>
         /// <param name="size">The size of the vector.</param>
+        /// <param name="fullyMutable">True if all fields must be mutable.</param>
         /// <returns>
         /// A <see cref="Vector{T}"/> with the given dimension.
         /// </returns>

src/Numerics/LinearAlgebra/Double/DiagonalMatrix.cs

@@ -176,6 +176,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double
         /// Creates a <see cref="Vector{T}"/> with a the given dimension.
         /// </summary>
         /// <param name="size">The size of the vector.</param>
+        /// <param name="fullyMutable">True if all fields must be mutable.</param>
         /// <returns>
         /// A <see cref="Vector{T}"/> with the given dimension.
         /// </returns>

src/Numerics/LinearAlgebra/Single/DiagonalMatrix.cs

@@ -176,6 +176,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single
         /// Creates a <see cref="Vector{T}"/> with a the given dimension.
         /// </summary>
         /// <param name="size">The size of the vector.</param>
+        /// <param name="fullyMutable">True if all fields must be mutable.</param>
         /// <returns>
         /// A <see cref="Vector{T}"/> with the given dimension.
         /// </returns>