Fix typos (#3608)

stable/minio/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 description: Distributed object storage server built for cloud applications and devops.
 name: minio
-version: 0.5.1
+version: 0.5.2
 keywords:
 - storage
 - object-storage

stable/minio/templates/_helper_create_bucket.txt

@@ -63,7 +63,7 @@ createBucket() {
     echo "Bucket '$BUCKET' already exists."
   fi
 
-  # At this point, the bucket should exist, skip checking for existance
+  # At this point, the bucket should exist, skip checking for existence
   # Set policy on the bucket
   echo "Setting policy of bucket '$BUCKET' to '$POLICY'."
   /usr/bin/mc policy $POLICY myminio/$BUCKET