message: docs: update npm install dev command to `npm install --save-dev`
  See:
  PR Close
diff: @@ -106,7 +106,7 @@ The packages listed in the `devDependencies` section of `package.json` help you
  To add a new `devDependency`, use either one of the following commands:
  <code-example language="sh" class="code-shell">
  - npm install --dev &lt;package-name&gt;
  + npm install --save-dev &lt;package-name&gt;
  </code-example>
  <code-example language="sh" class="code-shell">
  