Code style and doc typo (#23)

* Code style and doc typo

* Update MultipartStreamBuilder.php

src/MultipartStreamBuilder.php

@@ -247,10 +247,11 @@ private function basename($path)
             // For Windows OS add special separator.
             $separators .= DIRECTORY_SEPARATOR;
         }
-        // Remove right-most slashes when $uri points to directory.
+
+        // Remove right-most slashes when $path points to directory.
         $path = rtrim($path, $separators);
-        // Returns the trailing part of the $uri starting after one of the directory
-        // separators.
+
+        // Returns the trailing part of the $path starting after one of the directory separators.
         $filename = preg_match('@[^'.preg_quote($separators, '@').']+$@', $path, $matches) ? $matches[0] : '';
 
         return $filename;