[feat] remove unnecessary h2

Forgot this page in 38ff262

Author: MattDodsonEnglish

src/data/markdown/translated-guides/en/02 Using k6/14 Scenarios/01 Executors/07 externally-controlled.md

@@ -3,8 +3,6 @@ title: 'Externally controlled'
 excerpt: 'Control and scale execution at runtime via k6 REST API or the CLI.'
 ---
 
-## Description
-
 Control and scale execution at runtime via [k6's REST API](/misc/k6-rest-api) or
 the [CLI](https://k6.io/blog/how-to-control-a-live-k6-test).