[1.7.x] Clarified that LocMemCache is per-process; refs #7639.

This is the default cache if another is not specified in your settings file. If

you want the speed advantages of in-memory caching but don't have the capability

of running Memcached, consider the local-memory cache backend. This cache is

multi-process and thread-safe. To use it, set :setting:`BACKEND <CACHES-BACKEND>`

to ``"django.core.cache.backends.locmem.LocMemCache"``. For example::

per-process (see below) and thread-safe. To use it, set :setting:`BACKEND

<CACHES-BACKEND>` to ``"django.core.cache.backends.locmem.LocMemCache"``. For

example::

    CACHES = {

        'default': {