Modify the documentation and background_gc.erl default value for background_gc_enabled to false to match the behavior of the Makefile.

Author: FabianPonce

docs/rabbitmq.config.example

@@ -325,7 +325,7 @@
 
    %% Whether or not to enable background GC.
    %%
-   %% {background_gc_enabled, true},
+   %% {background_gc_enabled, false},
    %%
    %% Interval (in milliseconds) at which we run background GC.
    %%

src/background_gc.erl

@@ -74,7 +74,7 @@ interval_gc(State = #state{last_interval = LastInterval}) ->
     State#state{last_interval = Interval}.
 
 gc() ->
-    Enabled = rabbit_misc:get_env(rabbit, background_gc_enabled, true),
+    Enabled = rabbit_misc:get_env(rabbit, background_gc_enabled, false),
     case Enabled of
         true ->
             [garbage_collect(P) || P <- processes(),