Author: Huong Nguyen
MDL-66546 caching: Improve Redis help text
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5e0b16fa29dac0ed19725957d5a922f3fbe4bbf9
http://github.com/moodle/moodle/commit/5e0b16fa29dac0ed19725957d5a922f3fbe4bbf9
+ 4.4 en [server_help,cachestore_redis]
+ 4.4 en [test_server_desc,cachestore_redis]
- 4.4 en [server_desc,cachestore_redis]