[ci skip] correct select examples and doc, ref [522c0fd]
Merge pull request #14230 from kuldeepaggarwal/doc-select

Correct `select` examples and doc, ref [522c0fd] [ci skip]
set the error callback to a nice default in case nobody set an error callback and an error happens
[ci skip] use secrets.secret_key_base instead of config.secret_key_base
use secrets.yml instead of secret_token.rb
Merge pull request #14233 from kuldeepaggarwal/fix-secrets-doc

use `secrets.secret_key_base` instead of `config.secret_key_base`