Added DOT(.) at end of line (#28161)

Hi - I have observed Dot(.) is missing in many places of paragraphs in document. So raising this PR.

Added Dot(.) to below line
This page shows how to use regex to filter/modify values in the variable dropdown.

Thanks,
Ashish

docs/sources/variables/filter-variables-with-regex.md

@@ -13,7 +13,7 @@ weight = 700
 
 Using the Regex Query option, you filter the list of options returned by the variable query or modify the options returned.
 
-This page shows how to use regex to filter/modify values in the variable dropdown
+This page shows how to use regex to filter/modify values in the variable dropdown.
 
 Using the Regex Query Option, you filter the list of options returned by the Variable query or modify the options returned. For more information, refer to the Mozilla guide on [Regular expressions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions).