feat: Working on documentation

Sources/CliDocCore/TextModifier.swift

@@ -1,3 +1,7 @@
+/// A type that can modify a text node before it is rendered.
+///
+/// This allows you to create custom styles for your text-nodes.
+///
 public protocol TextModifier {
   // swiftlint:disable type_name
   associatedtype _Body: TextNode
@@ -6,6 +10,10 @@ public protocol TextModifier {
 
   associatedtype Content
 
+  /// Apply custom styling to the text node.
+  ///
+  /// - Parameters:
+  ///   - content: The text node to be styled.
   @TextBuilder
   func render(content: Content) -> Body
 }