Add documentation for retrySettings

I also made sure to notate that it's only in IBM for now

docs/snippets/full-secret-store.yaml

@@ -11,6 +11,14 @@ spec:
   # Optional
   controller: dev
 
+  # You can specify retry settings for the http connection
+  # these fields allow you to set a maxRetries before failure, and
+  # an interval between the retries.
+  # Current supported providers: IBM
+  retrySettings:
+    maxRetries: 5
+    retryInterval: "10s"
+
   # provider field contains the configuration to access the provider
   # which contains the secret exactly one provider must be configured.
   provider: