Fix API endpoint for registration-token (#31722)

Partially fix #31707. Related to #30656

Author: wolfogre

routers/api/v1/repo/action.go

@@ -486,7 +486,7 @@ func (Action) ListVariables(ctx *context.APIContext) {
 
 // GetRegistrationToken returns the token to register repo runners
 func (Action) GetRegistrationToken(ctx *context.APIContext) {
-	// swagger:operation GET /repos/{owner}/{repo}/runners/registration-token repository repoGetRunnerRegistrationToken
+	// swagger:operation GET /repos/{owner}/{repo}/actions/runners/registration-token repository repoGetRunnerRegistrationToken
 	// ---
 	// summary: Get a repository's actions runner registration token
 	// produces: