spelling: syntax

Signed-off-by: Josh Soref <[email protected]>

Author: jsoref

lib/Syntax/SyntaxSerialization.cpp.gyb

@@ -8,7 +8,7 @@
 }%
 //// Automatically Generated From SyntaxSerialization.cpp.gyb.
 //// Do Not Edit Directly!
-//===---------------------- SytnaxSerialization.cpp -----------------------===//
+//===---------------------- SyntaxSerialization.cpp -----------------------===//
 //
 // This source file is part of the Swift.org open source project
 //