Finished components guide. [skip ci]
minor doc fix [skip ci]
Update broken links in db-active-record.md

- update link to query builder guide
- update link to model guide
- update link to behaviors guide
- update link to database basic guide
Merge pull request #3334 from deerawan/master

Update broken links in db-active-record.md
Finished alias guide.
renamed basic concept chapter names.
fixed wrong file name.
added anchors to guide. [skip ci]
Finished autoloading chapter [skip ci]
minor touchup [skip ci]
anchor. [skip ci]
adjusted guide renderer to new guide structure
Advanced app `init` usage example typo fix
Merge pull request #3339 from creocoder/advanced-app-init-typo-fix

Advanced app `init` usage example typo fix
note about advanced app custom aliaes

fixes #3342
typo
Merge branch '2018-fix-gii-crud' of github.com:johonunu/yii2 into johonunu-2018-fix-gii-crud
Merge branch 'johonunu-2018-fix-gii-crud'
Fixes #2018: Adjusted changelog
Merge branch 'origin/master'