remove unused require

not used remove_possible_method
Minor code duplication removed
Fix guide section about assets precompiling task in production [ci skip]

You need to specify `RAILS_ENV=production`

Related to https://github.com/rails/sass-rails/issues/152.

/cc @guilleiguaran
Merge pull request #10378 from frodsan/fix_precompiling_assets_section

Fix assets precompiling in production guide
add missing :nodoc: marks to ActiveRecord::Delegation [ci skip]
Merge pull request #10379 from frodsan/fix_nodoc_ar_delegation

add missing :nodoc: marks to ActiveRecord::Delegation [ci skip]
Moved update_record logic to relation.rb
Make `rake doc:guides` works again.  Fix #10384.
Merge pull request #10383 from Noemj/bind_param_handling

Moved update_record logic to relation.rb
Merge pull request #10385 from siong1987/fix_rake_doc_guides

Make `rake doc:guides` works again.  Fix #10384.
Merge pull request #10357 from arunagw/minor-code-deuplication-removed-app-generator

Minor code duplication removed
Abort a rake task when missing db/structure.sql like `db:schema:load` task.
Rack::Mount was replaced by Journey, Fixed comment
Merge pull request #10387 from gaurish/rack-mount

Rack::Mount was replaced by Journey, Fixed comment
Merge pull request #10386 from kennyj/should_stop_task_when_missing_file

Abort a rake task when missing db/structure.sql like `db:schema:load` task.
mysql needs to reconnect after recreate. Thanks @mperham
add missing semicolon to journey parser.y
Merge pull request #10388 from benolee/fix-parser-semicolon

add missing semicolon to journey parser.y
Merge pull request #10339 from eiel/unused-require

remove unused require