fix: add missing ODH webhook wait command in platform-setup docs

The ODH tab's "Wait for the operator webhook to be ready" step had an
empty code block, blocking users from completing the installation.
Added the correct kubectl wait command matching the pattern used by the
Kuadrant and RHOAI tabs.

Resolves: RHOAIENG-55116

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Mynhardt Burger <mynhardt@gmail.com>

rh-pre-commit.version: 2.3.2
rh-pre-commit.check-secrets: ENABLED

Author: mynhardtburger

docs/content/install/platform-setup.md

@@ -388,8 +388,7 @@ Install the platform operator (ODH or RHOAI) and initialize the platform with DS
     Wait for the operator webhook to be ready:
 
     ```shell
-    
-    
+    kubectl wait --for=condition=Available --timeout=120s deployment/opendatahub-operator-controller-manager -n openshift-operators
     ```
 
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