Remove spurious '#' to fix ToC verify

Author: vinaykul

keps/sig-node/1287-in-place-update-pod-resources/README.md

@@ -729,7 +729,7 @@ when drafting this test plan.
 existing tests to make this code solid enough prior to committing the changes necessary
 to implement this enhancement.
 
-##### Prerequisite testing updates
+#### Prerequisite testing updates
 
 <!--
 Based on reviewers feedback describe what additional tests need to be added prior