Added missing `// MARK: - …` to implementation files

Sources/Surge/General Arithmetic/Arithmetic.swift

@@ -588,6 +588,8 @@ public func dist<L: UnsafeMemoryAccessible, R: UnsafeMemoryAccessible>(_ lhs: L,
     return sqrt(distSq(lhs, rhs))
 }
 
+// MARK: - Distance Squared
+
 public func distSq<L: UnsafeMemoryAccessible, R: UnsafeMemoryAccessible>(_ lhs: L, _ rhs: R) -> Float where L.Element == Float, R.Element == Float {
     precondition(lhs.count == rhs.count, "Vectors must have equal count")
     let sub = lhs .- rhs

Sources/Surge/Linear Algebra/Matrix.swift

@@ -30,6 +30,8 @@ public struct Matrix<Scalar> where Scalar: FloatingPoint, Scalar: ExpressibleByF
     public let columns: Int
     var grid: [Scalar]
 
+    // MARK: - Initialization
+
     public init(rows: Int, columns: Int, repeatedValue: Scalar) {
         self.rows = rows
         self.columns = columns
@@ -90,6 +92,8 @@ public struct Matrix<Scalar> where Scalar: FloatingPoint, Scalar: ExpressibleByF
         return matrix
     }
 
+    // MARK: - Subscript
+
     public subscript(row: Int, column: Int) -> Scalar {
         get {
             assert(indexIsValidForRow(row, column: column))

Sources/Surge/Linear Algebra/Vector.swift

@@ -29,7 +29,7 @@ public struct Vector<Scalar> where Scalar: FloatingPoint, Scalar: ExpressibleByF
         }
     }
 
-    // MARK: - Initialize
+    // MARK: - Initialization
 
     public init(dimensions: Int, repeatedValue: Scalar) {
         let scalars = Array(repeating: repeatedValue, count: dimensions)