chore: remove *_collector for prometheus api's example

apps/emqx_prometheus/src/emqx_prometheus.app.src

@@ -2,7 +2,7 @@
 {application, emqx_prometheus, [
     {description, "Prometheus for EMQX"},
     % strict semver, bump manually!
-    {vsn, "5.0.9"},
+    {vsn, "5.0.10"},
     {modules, []},
     {registered, [emqx_prometheus_sup]},
     {applications, [kernel, stdlib, prometheus, emqx, emqx_management]},

apps/emqx_prometheus/src/emqx_prometheus_api.erl

@@ -122,13 +122,7 @@ prometheus_config_example() ->
         interval => "15s",
         push_gateway_server => <<"http://127.0.0.1:9091">>,
         headers => #{'header-name' => 'header-value'},
-        job_name => <<"${name}/instance/${name}~${host}">>,
-        vm_dist_collector => enabled,
-        mnesia_collector => enabled,
-        vm_statistics_collector => enabled,
-        vm_system_info_collector => enabled,
-        vm_memory_collector => enabled,
-        vm_msacc_collector => enabled
+        job_name => <<"${name}/instance/${name}~${host}">>
     }.
 
 prometheus_data_schema() ->