docs: document gRPC server and gRPC output service config options

Co-authored-by: Lorenzo Fontana <lo@linux.com>
Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>

falco.yaml

@@ -168,6 +168,11 @@ http_output:
   enabled: false
   url: http://some.url
 
+# gRPC server configuration.
+# The gRPC server is secure by default (mutual TLS) so you need to generate certificates and update their paths here.
+# By default the gRPC server is off.
+# You can configure the address to bind and expose it.
+# By modifying the threadiness configuration you can fine-tune the number of threads (and context) it will use.
 grpc:
   enabled: false
   bind_address: "0.0.0.0:5060"
@@ -176,5 +181,8 @@ grpc:
   cert_chain: "/etc/falco/certs/server.crt"
   root_certs: "/etc/falco/certs/ca.crt"
 
+# gRPC output service.
+# By default it is off.
+# By enabling this all the output events will be kept in memory until you read them with a gRPC client.
 grpc_output:
-  enabled: true
+  enabled: false