Add new glossary word (#115070)

* Docs: Add grafanactl term to glossary

* Edit to adapt to Glossary def length

* Fix

* Real fix

* Fix link

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Co-authored-by: Jack Baldry <jack.baldry@grafana.com>

docs/sources/fundamentals/glossary/index.md

@@ -83,6 +83,11 @@ This topic lists words and abbreviations that are commonly used in the Grafana d
       A commonly-used visualization that displays data as points, lines, or bars.
     </td>
   </tr>
+  <tr>
+    <td style="vertical-align: top"><code>grafanactl</code></td>
+    <td>
+      A command-line tool that enables users to authenticate, manage multiple environments, and perform administrative tasks through Grafana's REST API. 
+  </tr>
   <tr>
     <td style="vertical-align: top">mixin</td>
     <td>