Added missing example to controllers.md
fixed typo

fixed typo in queue worker link
Fix typo in releases.md

Fixed a typo in the word 'Homestead' under the Laravel Homestead section.
Update upgrade.md

Spelling fixed: shuold -> should
Update facades.md

missing `|` in line for `Validator (Instance)`
Add note on security of guarded.
Merge branch '4.1' into 4.2
Mailgun -> Mandrill
Update upgrade guide.
Fix conflicts.
Add clarification.
Merge branch '4.1' into 4.2
Typo fix in upgrade.md
Fix typo.
fixing spelling mistakes using aspell

Conflicts:
	billing.md
	homestead.md
	migrations.md
	queues.md
	releases.md
	upgrade.md
Fix wording in extending.md
Fix wording in pagination.md
Fix link typo.
Fix typo.
Merge pull request #789 from tomxc/4.2

Fix link typo.