update rationale (#4222)

demisto_sdk/commands/validate/validators/DO_validators/DO106_docker_image_is_latest_tag.py

@@ -25,7 +25,7 @@
 class DockerImageTagIsNotOutdated(BaseValidator[ContentTypes]):
     error_code = "DO106"
     description = "Validate that the given content-item's docker image isnt outdated'"
-    rationale = "Updated docker images ensure the code dont use outdated dependencies, including bugfixes and fixed vulnerabilities."
+    rationale = "Updated Docker images ensure that the code doesn't use outdated dependencies, including bug fixes and fixed vulnerabilities."
     error_message = "docker image {0}'s tag {1} is outdated. The latest tag is {2}"
 
     fix_message = "docker image {0} has been updated to {1}"