docs: code-format repro commands in bug report template

Co-authored-by: Amaan Qureshi <amaanq12@gmail.com>

Author: samestep

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -13,9 +13,11 @@ body:
     attributes:
       label: "Steps to reproduce"
       placeholder: |
+        ```sh
         git clone --depth=1 https://github.com/tree-sitter/tree-sitter-ruby
         cd tree-sitter-ruby
         tree-sitter generate
+        ```
     validations:
       required: true