Fixed Effected version typo

Author: mburke5678

KNOWN_ISSUES.md

@@ -1,7 +1,7 @@
 # Frequent issues in latest releases
 
 ## [Some optional operators from OCP are not available in OKD](https://github.com/openshift/okd/issues/456)
-  **Effected Versions:** All
+  **Affected Versions:** All
 
   **Description:** OCP users can install Logging/Serverless/GPU and other operators from Red Hat OperatorHub. This requires redhat.io pull secret, which may not be available for OKD users.