Merge pull request #30904 from benoittgt/document-ideal-registry-login-command

[Doc] Help users avoid specifying URL scheme and path with `helm registry`

pkg/cmd/registry_login.go

@@ -34,6 +34,10 @@ import (
 
 const registryLoginDesc = `
 Authenticate to a remote registry.
+
+For example for Github Container Registry:
+
+    echo "$GITHUB_TOKEN" | helm registry login ghcr.io -u $GITHUB_USER --password-stdin
 `
 
 type registryLoginOptions struct {