Update templates.md

Removed unnecessary semicolons
Update events.md
Update validation.md
Fix typo
Incorrectly used "custom cache driver"

Used "custom cache driver" instead of "custom session driver/extension" in the "Writing The Session Extension" section.
Added explanation for $table->double()
Broken link anchor
Merge pull request #993 from FlorianChedemail/patch-1

Fixed broken link anchor in the Routing page
Merge pull request #990 from tscheepers/patch-1

Added explanation for $table->double()
Merge pull request #989 from Soulen/patch-1

Incorrectly used "custom cache driver"
Merge pull request #980 from rmccullagh/4.2

Fix typo
Merge pull request #979 from Kyslik/4.2

Update events.md & validation.md
Merge pull request #970 from ArtemFitiskin/patch-1

Update templates.md
fix conflicts.