Update DocC.

Signed-off-by: Ross Goldberg <[email protected]>

Author: rgoldberg

Sources/ArgumentParser/Parsable Properties/CompletionKind.swift

@@ -179,7 +179,7 @@ public struct CompletionKind {
   /// Deprecated; only kept for backwards compatibility.
   ///
   /// The same as `custom(@Sendable @escaping ([String], Int, String) -> [String])`,
-  /// except that index arguments are not supplied.
+  /// except that the last two closure arguments are not supplied.
   @preconcurrency
   @available(
     *,

Sources/ArgumentParserToolInfo/ToolInfo.swift

@@ -149,9 +149,9 @@ public struct ArgumentInfoV0: Codable, Hashable {
     case directory
     /// Call the given shell command to generate completions.
     case shellCommand(command: String)
-    /// Generate completions using the given closure including index arguments.
+    /// Generate completions using the given three-argument closure.
     case custom
-    /// Generate completions using the given closure without index arguments.
+    /// Generate completions using the given one-argument closure.
     @available(*, deprecated, message: "Use custom instead.")
     case customDeprecated
   }