docs: fix broken link to prefer-expect-query-by (#46)

Author: Jon Aldinger

docs/rules/prefer-explicit-assert.md

@@ -76,7 +76,7 @@ method itself, then this rule is not recommended.
 
 ## Related Rules
 
-- [prefer-expect-query-by](docs/rules/prefer-expect-query-by.md)
+- [prefer-expect-query-by](prefer-expect-query-by.md)
 
 ## Further Reading