[FIX] coding_guidelines: Add comment to indicate ASCII-based ordering

Following the fix - 92c7099
Adding a comment to explicitly indicate that the import is ordered
alphabetically based on ASCII values.

closes #12962

X-original-commit: a9577b5
Signed-off-by: Harsh Modi (hamo) <hamo@odoo.com>

Author: hamo-odoo

content/contributing/development/coding_guidelines.rst

@@ -424,7 +424,7 @@ Inside these 3 groups, the imported lines are alphabetically sorted.
     import time
     from datetime import datetime
     # 2 : imports of odoo
-    from odoo import Command, _, api, fields, models # alphabetically ordered
+    from odoo import Command, _, api, fields, models # ASCIIbetically ordered
     from odoo.fields import Domain
     from odoo.tools.safe_eval import safe_eval as eval
     # 3 : imports from odoo addons