fix link again

Author: ajaysundark

keps/sig-node/5233-node-readiness-gates/README.md

@@ -11,7 +11,7 @@
     -  [Non-Goals](#non-goals)
 
 -  [Proposal](#proposal)
-    -  [Main-Idea] (#main-idea)
+    -  [Main Idea](#main-idea)
     -  [User Stories](#user-stories-optional)
     -  [Example Walkthrough](#example-walkthrough)
     -  [Notes/Constraints/Caveats](#notesconstraintscaveats)
@@ -122,7 +122,7 @@ This KEP does not aim to
 
 ## Proposal
 
-### Main Idea:
+### Main Idea
 
 This proposal's core idea is to make a node's transition to a fully schedulable state dependent not only on the Kubelet's default `Ready` condition but also on custom criteria defined by the cluster administrator.