[gardening] typo "teh" → "the"

Author: WowbaggersLiquidLunch

stdlib/public/SwiftShims/SwiftStddef.h

@@ -27,7 +27,7 @@
 // dependency between `ucrt` and `SwiftShims`, preventing a successful build of
 // the module.
 //
-// Opt to use teh compiler vended type whenever possible.
+// Opt to use the compiler vended type whenever possible.
 #if defined(__clang__)
 typedef __SIZE_TYPE__ __swift_size_t;
 #else