fix bad apostrophe

text.js

@@ -140,7 +140,7 @@ FastTextDecoder.prototype['decode'] = function(buffer, options={stream: false})
     throw new Error(`Failed to decode: the 'stream' option is unsupported.`);
   }
 
-  // Accept Uint8Array's as-is.
+  // Accept Uint8Array instances as-is.
   let bytes = buffer;
 
   // Look for ArrayBufferView, which isn't a real type, but basically represents