docs: improve module plugin explanation (#5851)

Author: ldez

docs/src/docs/plugins/module-plugins.mdx

@@ -9,7 +9,7 @@ An example linter can be found at [here](https://github.com/golangci/example-plu
 - Define your building configuration into `.custom-gcl.yml`.
 - Run the command `golangci-lint custom` (or `golangci-lint custom -v` to have logs).
 - Define the plugin inside the `linters.settings.custom` section with the type `module`.
-- Run your custom version of golangci-lint.
+- Run the resulting custom binary of golangci-lint (`./custom-gcl` by default).
 
 Requirements:
 - Go