Fix follow-up for bumping catalogd to v0.36.0: Update pollInterval to pollIntervalMinutes in ClusterCatalog spec

In #1434, the API was updated to use pollIntervalMinutes instead of pollInterval.
This commit ensures all references are properly updated.

See: https://github.com/operator-framework/operator-controller/pull/1434/files#diff-93b46b0715181c9cf397eed60862261b7839ff721599fcc393a393b9edea610bR57

Author: camilamacedo86

config/samples/catalogd_operatorcatalog.yaml

@@ -7,4 +7,4 @@ spec:
     type: Image
     image:
       ref: quay.io/operatorhubio/catalog:latest
-      pollInterval: 10m
+      PollIntervalMinutes: 10m

docs/getting-started/olmv1_getting_started.md

@@ -44,7 +44,7 @@ spec:
     type: Image
     image:
       ref: quay.io/operatorhubio/catalog:latest
-      pollInterval: 10m
+      PollIntervalMinutes: 10m
 EOF
 ```
 

docs/tutorials/add-catalog.md

@@ -35,7 +35,7 @@ This catalog is distributed as an image [quay.io/operatorhubio/catalog](https://
         type: Image
         image:
           ref: <catalog_image>
-          pollInterval: <poll_interval_duration>
+          PollIntervalMinutes: <poll_interval_duration>
     ```
 
     `catalog_name`
@@ -57,7 +57,7 @@ This catalog is distributed as an image [quay.io/operatorhubio/catalog](https://
         type: Image
         image:
           ref: quay.io/operatorhubio/catalog:latest
-          pollInterval: 10m
+          PollIntervalMinutes: 10m
     ```
 
 2. Apply the ClusterCatalog CR: