Co-authored-by: NHaroon Ahmed <haroon.ahmed25@gmail.com>

without the `.unscoped` call this can break if a base model happens to have a default scope.

The following loop constantizes after logging.

Some code examples were missing the language used for code highlighting.

The javascript directory under app/ is in a singular form (app/javascript) but the documentation was mentionning it in the plural form (app/javascripts).

Initially I just wanted to remove _to_ from _We call autoload paths to
the list..._. But this sentence also seemed a little bit overcomplicated
😅

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This is the conventional name for that parameter.

This 6.x seems to be confusing to some people.

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This is a first draft only, needs polishing for final.

Closes #32885.

http links will be redirected to the https version, but still better to
just directly link to the https version.

As discussed in #33203 rails command already looks for, and runs,
bin/rails if it is present.

We were mixing recommendations within guides and USAGE guidelines,
in some files we recommended using rails, in others bin/rails and
in some cases we even had both options mixed together.

Once all technicalities have been introduced, the purpose of this
paragraph is to precisely unroll expressions like "the String class".
That way, the reader is forced to clearly separate concepts that Ruby
programmers often have kind of blurred:

  * Constants are storage, like variables.

  * Ruby does not have syntax for class or module names.

  * `String` is a regular constant that holds a value. In this case, the
    value happens to be a class object.

  * Constants are stored in class and module objects. In the case of
    `String`, the holder is the class object stored in the `Object`
    constant.

Understanding that paragraph the way is written is important to
accomplish this objective.

References #32818.

correction to #31755 as per https://github.com/rails/rails/pull/31755#discussion_r165819798

This is a pass over the documentation which fills the missing gaps of
`ApplicationRecord`.

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