Tooltips

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<details class="go-Tooltip js-tooltip" data-gtmc="tooltip">
  <summary>
    Valid <a href="#tooltips">go.mod</a> file
    <img class="go-Icon" height="24" width="24" src="/static/_icon/help_gm_grey_24dp.svg" alt="" />
  </summary>
  <p>
    The Go module system was introduced in Go 1.11 and is the official dependency management
    solution for Go.
  </p>
</details>