update changelog

Author: michalsn

user_guide_src/source/changelogs/v4.6.3.rst

@@ -31,7 +31,7 @@ Bugs Fixed
 **********
 
 - **Email:** Fixed a bug with CID check when building email attachments.
-- **Email:** Fixed SMTP connection resource validation in the class destructor.
+- **Email:** Fixed a bug with SMTP connection resource validation in the class destructor.
 
 See the repo's
 `CHANGELOG.md <https://github.com/codeigniter4/CodeIgniter4/blob/develop/CHANGELOG.md>`_