Sync with php-fig/http-message#45

This patch duplicates php-fig/http-message#45, which corrects the method
docblock for `ServerRequestInterface::withUploadedFiles()` to provide the name
of the accepted parameter.

accepted/PSR-7-http-message.md

@@ -1063,7 +1063,7 @@ interface ServerRequestInterface extends RequestInterface
      * immutability of the message, and MUST return an instance that has the
      * updated body parameters.
      *
-     * @param array An array tree of UploadedFileInterface instances.
+     * @param array $uploadedFiles An array tree of UploadedFileInterface instances.
      * @return self
      * @throws \InvalidArgumentException if an invalid structure is provided.
      */