[Uk] Updating documentation and fixing typos
[ci skip]
 [Uk] Fixing typos
[ci skip]
Merge pull request #2468 from yiiframework-com-ua/uk_docs

[Uk] Updating UK docs
 [Uk] Fixing typos
[ci skip]
 [Uk] Fixing typos
[ci skip]
Merge pull request #2469 from yiiframework-com-ua/uk_docs

[Uk] Updating UK docs
[ci skip]