Typo in ehache 2.7 docs

[jhouserizer]

There is a typo in ehcache 2.8 docs, with an unfortunate, superfluous "NOT", in a sentence that reads "Ehcache is not for both general-purpose caching...".

This occurs in file:

ehcache.org-site/documentation/2.8/get-started/introduction.md

The corrected wording, which is in other versions of doc is:

"Ehcache is not just for general-purpose caching, however, but also for caching Hibernate (second-level cache), data access objects, security credentials, web pages."