GH-45883: [Docs] Update GitHub Issue Template for GitHub Discussions (#45884)

### Rationale for this change

Closes #45883.

### What changes are included in this PR?

- Updated template for new issues

### Are these changes tested?

- Proofread

### Are there any user-facing changes?

No.
* GitHub Issue: #45883

Authored-by: Bryce Mecum <[email protected]>
Signed-off-by: Raúl Cumplido <[email protected]>

Author: amoeba

.github/ISSUE_TEMPLATE/usage_question.yaml

@@ -23,12 +23,14 @@ body:
   - type: markdown
     attributes:
       value: >
-        While we enable issues as a mechanism for new contributors and
+        While we enable Issues as a mechanism for new contributors and
         passers-by who are unfamiliar with Apache Software Foundation projects
         to ask questions and interact with the project, we encourage users to
-        ask such questions on the [public mailing
-        lists](https://arrow.apache.org/community/) as these provide higher
-        visibility than GitHub issues:
+        ask such questions using either [GitHub
+        Discussions](https://github.com/apache/arrow/discussions) or the mailing
+        lists.
+
+        If you prefer to use the mailing lists,
 
         * For usage questions, please email [email protected] (first
         subscribe by sending an e-mail to [email protected]).
@@ -41,7 +43,8 @@ body:
         page](https://arrow.apache.org/community/) for more information on the
         mailing lists as well as for a link to the searchable archives.
 
-        Do not be surprised by responses to issues raised here directing you to those
+        Do not be surprised by responses to Issues raised here directing you to
+        [Discussions](https://github.com/apache/arrow/discussions) or the
         mailing lists, or to report a bug or feature request here.
 
         Thank you!