Update stdlib/public/core/KeyPath.swift

Co-Authored-By: Max Desiatov <[email protected]>

stdlib/public/core/KeyPath.swift

@@ -2545,7 +2545,7 @@ internal func _resolveRelativeAddress(_ base: UnsafeRawPointer,
                                       _ offset: Int32) -> UnsafeRawPointer {
   #if arch(wasm32)
   // FIXME: If offset is 0, it means the pointer is null.
-  // For real relative pointer, it always calculate valid non-null address
+  // For real relative pointer, it always calculates valid non-null address
   // because the base address is always valid.
   // But hacked absolute pointer can be null pointer.
   // The return type doesn't allow nil, so return given base temporarily.