Update errors.md

There was a small typo (a missing "c"). I changed:
funtion
To
function.
Fixed typos
Typo fixed.
Adding Input::old() documentation
Merge pull request #23 from briankiewel/master

fixed broken server requirements link on installation doc
Merge pull request #24 from MarkRedeman/patch-1

Update errors.md
Merge pull request #26 from pedroborges/patch-1

Typo fixed.
Merge pull request #27 from akuzemchak/patch-1

Adding Input::old() documentation
Merge pull request #25 from pborreli/typos

Fixed typos
added clarification on boot and register. tweaked install link.
Added templates section.
Reverting array syntax for routes and responses.
Reverting array syntax for Controllers.
Reverting array syntax for Events.
Reverting array syntax for Localization.
update download link.
Reverting array syntax for Mail.
Reverting array syntax for Security.
Reverting array syntax for Session.
Fixing comment in templates.