feat(docs): update data entry and dropdown topics#435

Hristo313 wants to merge 6 commits into

mpopov/new-docs-skillIgniteUI/igniteui-documentation:mpopov/new-docs-skillfrom

hhristov/update-data-entry-and-display-sectionIgniteUI/igniteui-documentation:hhristov/update-data-entry-and-display-sectionCopy head branch name to clipboard