docs: add missing period in changelog bug fix entry (#7244)

Co-authored-by: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

Author: mintlify[bot]

changelog.mdx

@@ -1076,7 +1076,7 @@ noindex: true
 
   ## Bug fixes
 
-  - Fixed Columns component layout regression
+  - Fixed Columns component layout regression.
   - Fixed AsyncAPI enum parameters showing as plain type strings.
   - Fixed Aspen and Luma theme layout issues.
   - Fixed columns component layout breaking across multiple themes.