This includes minor grammar fixes throughout the file.

No need to set `cookie_only` option from Rails

Fix typo in test case

Pathname might not be always initialized.

Require 'pathname' explicitly

Fix typo: caches_pages to caches_page. [ci skip]

Fix a small typo on doc: "caches_pages" -> "caches_page".

test with latest resque

Don't reap connections that have already been reassigned

updating doc for prefer require_relative [ci skip]

Correct defaults in documentation for ActionDispatch::SSL

`config.ssl_options` permits configuring various options for the middleware. Default options for HSTS (specified with the `:hsts` key in the options hash) are specified in `.default_hsts_options`. The documentation did not make clear these defaults, and in one case was wrong.

[ci skip] Update ConnectionPool documentation for readability purposes

[ci skip] Remove reference to Rails 4 in the initialization guide.

Following commit removed reference to rails 4, but there is one left.

https://github.com/rails/rails/commit/a9f50f87c38659d0e9425f86f613cf5328d55d27

Bump version for master bug report templates

remove `-t` option from default sendmail arguments [ci skip]

Follow up to #24436

This way, we aren't racing other threads, so we don't need to re-check
the conditional. And we no longer need to hold the lock while calling
remove (which can choose to make a new connection while we wait).

A concurrent thread may have also detected it to be stale, and already
released (or even reassigned) it by now.

Fixes #25585

A thread can only release a connection if it owns it, or it's owned by a
thread that has died.

 `travel/travel_to` travel time helpers, now raise on nested calls

Merge pull request #25704 from fledman/add_respond_to_missing_to_rails_application_configuration_custom

implement respond_to_missing? to match method_missing

Use `squish` rather than `strip_heredoc`

Allow rake notes to work with other directories.

Deprecate usage of nil as route path

In Rails 4 these kind of routes used to work:

```ruby
scope '/*id', controller: :builds, as: :build do
  get action: :show
end
```

But since 1a830cbd, routes are only created for
paths specified as strings or symbols. Implicit `nil` paths are just ignored,
with no deprecation warnings or errors. Routes are simply not created. This come
as a surprise for people migrating to Rails 5, since the lack of logs or errors
makes hard to understand where the problem is.

This commit introduces a deprecation warning in case of path as `nil`, while
still allowing the route definition.

Display railtie class name in `rails initializers`

accidently set it to.

Made the change and test still passes.

Add header demarcation to Action Cable guide

Guide generation is configured to detect a guide header by a 40-or-more-hyphen long line. The Action Cable guide was missing this line, so the page title on the guides site was only showing "Ruby on Rails Guides", and the section title in the Kindle index was "Ruby on Rails Guides". Adding the header demarcation line back in fixes both of these.

Fixes #25697

[ci skip]

Point to the correct documentation

The options used in this file are *not* directly described in the Rails 5.0
release notes (http://edgeguides.rubyonrails.org/5_0_release_notes.html), but
instead in section 2 of the Guide for Upgrading Ruby on Rails document
(http://edgeguides.rubyonrails.org/upgrading_ruby_on_rails.html).