docs(gh-pages): rename stale CC config key min.monitored.partition.percentage -> min.valid.partition.ratio

The key was renamed by Cruise Control in PR banzaicloud#781 (2019); the old name is
silently ignored by current Cruise Control. Update the published docs to the
correct key name.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: amuraru

content/docs/e2e-tutorial/kafka-deployment.md

@@ -193,7 +193,7 @@ spec:
       hard.goals=com.linkedin.kafka.cruisecontrol.analyzer.goals.RackAwareGoal,com.linkedin.kafka.cruisecontrol.analyzer.goals.ReplicaCapacityGoal,com.linkedin.kafka.cruisecontrol.analyzer.goals.DiskCapacityGoal,com.linkedin.kafka.cruisecontrol.analyzer.goals.NetworkInboundCapacityGoal,com.linkedin.kafka.cruisecontrol.analyzer.goals.NetworkOutboundCapacityGoal,com.linkedin.kafka.cruisecontrol.analyzer.goals.CpuCapacityGoal
       
       # The minimum percentage of well monitored partitions out of all the partitions
-      min.monitored.partition.percentage=0.95
+      min.valid.partition.ratio=0.95
       
       # The balance threshold for CPU
       cpu.balance.threshold=1.1