Add docs issue template. (#3105)

.github/ISSUE_TEMPLATE/documentation_request.md

@@ -0,0 +1,31 @@
+---
+name: Documentation request
+about: Suggest a documentation enhancement
+title: "[Documentation topic]"
+labels: documentation
+assignees: ""
+---
+
+<!--
+
+Hi 👋, thank you for submitting a documentation enhancement to Quickwit!
+
+Don't forget to replace the title of this issue with a short
+sentence that describes the topic of your enhancement!
+
+-->
+
+## My documentation idea
+
+Use this section to give a description of what your enhancement is about.
+
+Examples:
+
+> I would like to add how to configure MinIO storage for Quickwit:
+>
+
+**What do you all think?**
+👍 I would love to see it!
+🚀 I would love to help!
+
+Thank you for your request!