message: docs: added value param wrt. method signature
  PR Close
diff: @@ -139,8 +139,8 @@ export class HttpHeaders {
  * Appends a new value to the existing set of values for a header
  * and returns them in a clone of the original instance.
  *
  - * @param name The header name for which to append the value or values.
  - * @param value The new value or array of values.
  + * @param name The header name for which to append the values.
  + * @param value The value to append.
  *
  * @returns A clone of the HTTP headers object with the value appended to the given header.
  */
  