Correct fixed-width doc syntax, thanks to @sikachu for pointing it out!

From dc5854f and c07c0b2 [ci skip]
added example for hash slice method [ci skip]
fixed  typo [ci skip]
Merge pull request #17500 from rishijain/update_docs_4

added example for hash slice method [ci skip]
Merge pull request #17488 from rishijain/update_docs_3

minor docs change [ci skip]
update rails version for earlier releases in edgeguides
Merge pull request #17504 from Gaurav2728/gaurav-update_edgeguide

update rails version for earlier releases in edgeguides [ci skip]
fix typo [ci skip]
Merge branch 'master' of github.com:rails/rails
Merge pull request #17480 from gsamokovarov/exception-wrapper-traces

Move DebugExceptions#traces_from_wrapper to ExceptionWrapper
Added SchemaDumper support for tables with jsonb columns.
Merge pull request #17443 from tomeara/added_jsonb_to_postgres_database_types

Added SchemaDumper support for tables with jsonb columns
Mention that articles resource should be added by user in getting started guide

[ci skip]
Merge pull request #17508 from prathamesh-sonpatki/mention-adding-resources-to-routes

Mention that articles resource should be added by user in getting started guide

Fixes #17507 [ci skip]
add a test for #17106
activerecord: rake db:create shows underlying error message.
add lib to $LOAD_PATH on application inhertence. fixes #17106
Merge branch '17106'

* 17106:
  add lib to $LOAD_PATH on application inhertence. fixes #17106
  add a test for #17106
[ci skip] Fixup spelling and grammar in 4.2 guides

Capitalize CSS, SQL

Change spelling of favour to favor - updated for consistency,
the rest of the document uses "favor".

Grammar / spelling pass
Merge pull request #17513 from eileencodes/cleanup-rails-4.2-release-notes

Fixup spelling and grammar in 4.2 guides