Add documentation

Sources/SwiftUIMath/RenderingMode.swift

@@ -1,10 +1,14 @@
 import SwiftUI
 
 extension Math {
+  /// Controls how colors are applied when rendering math.
   public enum RenderingMode: Sendable {
+    /// Draws all glyphs using the view's foreground style.
     case monochrome
+    /// Honors LaTeX color commands and uses the base color for uncolored glyphs.
     case multicolor(base: SwiftUI.Color)
 
+    /// Multicolor rendering using the view's primary color as the base.
     static var multicolor: Self {
       .multicolor(base: .primary)
     }
@@ -12,6 +16,7 @@ extension Math {
 }
 
 extension View {
+  /// Sets the rendering mode for ``Math`` views in this hierarchy.
   public func mathRenderingMode(_ mathRenderingMode: Math.RenderingMode) -> some View {
     environment(\.mathRenderingMode, mathRenderingMode)
   }