remove outdated info about cache concurrency strategies support

Description

since version 2.1 Ehcache supports transactional strategy which results in having support for all cache concurrency strategies

Environment

None

Status

Assignee

Brett Meyer

Reporter

kamild

Fix versions

Labels

backPortable

None

Suitable for new contributors

None

Requires Release Note

None

Pull Request

None

backportDecision

None

Components

Priority

Minor
Configure