Fix typo in documentation comment

Niclas Kristek · Niclas Kristek · commit c29c6b5f1e74 · 2020-10-05T13:12:45.000+02:00
diff --git a/Sources/Optional.swift b/Sources/Optional.swift
@@ -8,7 +8,7 @@
 
 /// An optional protocol for use in type constraints.
 public protocol OptionalProtocol: ExpressibleByNilLiteral {
-	/// The type contained in the otpional.
+	/// The type contained in the optional.
 	associatedtype Wrapped
 
 	init(reconstructing value: Wrapped?)
