Fix typo

Author: kateinoigakukun

lib/IRGen/GenBuiltin.cpp

@@ -400,7 +400,7 @@ if (Builtin.ID == BuiltinValueKind::id) { \
 
     // Remove swiftself and swifterror attribute to match signature generated from
     // RuntimeFunctions.def. These two parameters are passed using swifterror and swiftself,
-    // but the definition of swift_willThrow generated from the def file doesn't has those
+    // but the definition of swift_willThrow generated from the def file doesn't have those
     // attributes due to the def file limitation. In WebAssembly context, these attributes are
     // lowered as usual parameters, so this doesn't have any side effects.
     if (IGF.IGM.TargetInfo.OutputObjectFormat != llvm::Triple::Wasm) {

stdlib/public/runtime/ErrorObject.h

@@ -210,7 +210,7 @@ void swift_errorRelease(SwiftError *object);
 // Notes:
 // Remove swiftself and swifterror attribute to match signature generated from
 // RuntimeFunctions.def. These two parameters are passed using swifterror and swiftself,
-// but the definition of swift_willThrow generated from the def file doesn't has those
+// but the definition of swift_willThrow generated from the def file doesn't have those
 // attributes due to the def file limitation. In WebAssembly context, these attributes are
 // lowered as usual parameters, so this doesn't have any side effects.
 SWIFT_CC(swift) SWIFT_RUNTIME_STDLIB_API