docs: fix JSDoc for req.accepts() return value and parameter format (#6936)

* fixed request accept jsdoc

* reverted format

* reverted format

* updated jsdoc

* updated the rest of the documentation

lib/request.js

@@ -83,16 +83,13 @@ req.header = function header(name) {
 };
 
 /**
- * To do: update docs.
- *
  * Check if the given `type(s)` is acceptable, returning
- * the best match when true, otherwise `undefined`, in which
+ * the best match when true, otherwise `false`, in which
  * case you should respond with 406 "Not Acceptable".
  *
  * The `type` value may be a single MIME type string
  * such as "application/json", an extension name
- * such as "json", a comma-delimited list such as "json, html, text/plain",
- * an argument list such as `"json", "html", "text/plain"`,
+ * such as "json", an argument list such as `"json", "html", "text/plain"`,
  * or an array `["json", "html", "text/plain"]`. When a list
  * or array is given, the _best_ match, if any is returned.
  *
@@ -107,7 +104,7 @@ req.header = function header(name) {
  *     // => "html"
  *     req.accepts('text/html');
  *     // => "text/html"
- *     req.accepts('json, text');
+ *     req.accepts('json', 'text');
  *     // => "json"
  *     req.accepts('application/json');
  *     // => "application/json"
@@ -115,12 +112,11 @@ req.header = function header(name) {
  *     // Accept: text/*, application/json
  *     req.accepts('image/png');
  *     req.accepts('png');
- *     // => undefined
+ *     // => false
  *
  *     // Accept: text/*;q=.5, application/json
  *     req.accepts(['html', 'json']);
  *     req.accepts('html', 'json');
- *     req.accepts('html, json');
  *     // => "json"
  *
  * @param {String|Array} type(s)