Merge pull request rails#55246 from Earlopain/guides-fix-link-assert-difference

Author: vipulnsward

guides/source/testing.md

@@ -440,7 +440,7 @@ Rails adds some custom assertions of its own to the `minitest` framework:
 | [`assert_queries_match(pattern, count: nil, include_schema: false, &block)`][] | Asserts that `&block` generates SQL queries that match the pattern.|
 | [`assert_no_queries_match(pattern, &block)`][] | Asserts that `&block` generates no SQL queries that match the pattern.|
 
-[`assert_difference(expressions, difference = 1, message = nil) {...}`]: https://api.rubyonrails.org/classes/ActiveSupport/Testing/Assertions.html#method-i-assert_difference)
+[`assert_difference(expressions, difference = 1, message = nil) {...}`]: https://api.rubyonrails.org/classes/ActiveSupport/Testing/Assertions.html#method-i-assert_difference
 [`assert_no_difference(expressions, message = nil, &block)`]: https://api.rubyonrails.org/classes/ActiveSupport/Testing/Assertions.html#method-i-assert_no_difference
 [`assert_changes(expressions, message = nil, from:, to:, &block)`]: https://api.rubyonrails.org/classes/ActiveSupport/Testing/Assertions.html#method-i-assert_changes
 [`assert_no_changes(expressions, message = nil, &block)`]: https://api.rubyonrails.org/classes/ActiveSupport/Testing/Assertions.html#method-i-assert_no_changes