Small Action View Overview edits [ci skip]

Some small grammar and readability edits
Grammar pass

[ci skip]

Add improvements from @eileencodes [skip ci]
Make text consistent in help text of rails server and console commands.
Guide fix. [CI SKIP]

Related: https://github.com/rails/rails/pull/16607
[ci skip] Added documentation for has_one scope parameter
Merge pull request #16615 from tgxworld/guide_fix

[ci skip] Grammar fixes for upgrade guide from 4.0 to 4.1
Merge pull request #16617 from tomkadwill/added_has_one_scope_documentation

[ci skip] Added documentation for has_one scope parameter
Merge pull request #16204 from jonatack/patch-7

Fix minor typos and improve grammar and code formatting
Merge pull request #16271 from alol/action-view-overview-guide-tweaks

Small Action View Overview guide grammar and readability tweaks
Add change to ActionView Notable changes [ci skip]
Merge pull request #16621 from Calyhre/patch-1

Update documentation, Add change to ActionView Notable changes
applies API guidelines to new AM docs
ActiveJob -> Active Job [ci skip]

See http://guides.rubyonrails.org/api_documentation_guidelines.html#wording
Refactor ActionDispatch::RemoteIp

Refactored IP address checking in ActionDispatch::RemoteIp to rely on
the IPAddr class instead of the unwieldly regular expression to match
IP addresses. This commit keeps the same api but allows users to pass
IPAddr objects to config.action_dispatch.trusted_proxies in addition
to passing strings and regular expressions.

Example:

    # config/environments/production.rb
    config.action_dispatch.trusted_proxies = IPAddr.new('4.8.15.0/16')
fix server names [ci skip]

Per feedback in https://github.com/rails/rails/commit/af63e4a2546629c3fb2d53cffb7d4ea0e8663f68#commitcomment-7477636
fix grammar [ci skip]
Merge pull request #16604 from saarons/clean-remote-ip-middleware

ActionDispatch::RemoteIp accept IPAddr matches for trusted proxies
Revert "Add I18n support for `:placeholder` HTML option is passed to form fields"
Merge pull request #16629 from rails/revert-16438-input-placeholder-i18n

Revert "Add I18n support for `:placeholder` HTML option is passed to for...
[ci skip] Added documentation for has_and_belongs_to_many scope parameter