Improve documentation around new default for background garbage collection #1252
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2f3fb80 (v3.6.7) altered the default setting for
background_gc_enabled
to false, however, the default configuration files seem to imply that the default value for this is still set to true.This pull request corrects the default configuration and makes a small change to background_gc.erl so that the defaults which are set in the Makefile are clearly communicated to anyone viewing the source code as well.