message: docs: delete double dashes on ng command in testing guide
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diff: @@ -218,8 +218,8 @@ exports.config = config;
  Now you can run the following commands to use the `--no-sandbox` flag:
  <code-example language="sh" class="code-shell">
  - ng test -- --no-watch --no-progress --browsers=ChromeHeadlessCI
  - ng e2e -- --protractor-config=e2e/protractor-ci.conf.js
  + ng test --no-watch --no-progress --browsers=ChromeHeadlessCI
  + ng e2e --protractor-config=e2e/protractor-ci.conf.js
  </code-example>
  <div class="alert is-helpful">
  