Updated data-grid.md to fix wrong path to GridView

Path was wrong
Merge pull request #3156 from acorncom/fixed-data-grid-docs-error

Updated data-grid.md to fix wrong path to GridView
Added `yii\web\UrlManager::addRules()` to simplify adding new URL rules
Fixes #3088: The debug and gii modules will manage their own URL rules now
Fixes #3158
fixed typo. [skip ci]
Fix typo
Merge pull request #3160 from marsuboss/patch-1

Fix typo
Merge branch 'master'

Conflicts:
	framework/CHANGELOG.md