docs: note about plugin system (#5822)

Author: ldez

docs/src/docs/contributing/new-linters.mdx

@@ -43,5 +43,5 @@ Typically, these linters can't be open-sourced or too specific.
 
 Such linters can be added through 2 plugin systems:
 
-1. [Module Plugin System](/plugins/module-plugins)
+1. [Module Plugin System](/plugins/module-plugins) (Recommended)
 2. [Go Plugin System](/plugins/go-plugins)

docs/src/docs/plugins/go-plugins.mdx

@@ -2,6 +2,10 @@
 title: Go Plugin System
 ---
 
+**We recommend using [Module Plugin System](/plugins/module-plugins) instead of the Go Plugin System.**
+
+---
+
 Private linters can be added through [Go's plugin system](https://pkg.go.dev/plugin).
 
 For a private linter (which acts as a plugin) to work properly,