doc: add nconnect mount option in the doc

fix

Author: andyzhangx

deploy/example/nfs/README.md

@@ -19,8 +19,11 @@ kind: StorageClass
 metadata:
   name: blob-nfs
 provisioner: blob.csi.azure.com
+allowVolumeExpansion: true
 parameters:
   protocol: nfs
+mountOptions:
+  - nconnect=4
 ```
 
 run following command to create a storage class:

deploy/example/pv-blobfuse-nfs.yaml

@@ -12,6 +12,8 @@ spec:
     - ReadWriteMany
   persistentVolumeReclaimPolicy: Retain
   storageClassName: blob-nfs
+  mountOptions:
+    - nconnect=4
   csi:
     driver: blob.csi.azure.com
     readOnly: false

deploy/example/storageclass-blob-nfs.yaml

@@ -8,3 +8,5 @@ parameters:
   protocol: nfs
 volumeBindingMode: Immediate
 allowVolumeExpansion: true
+mountOptions:
+  - nconnect=4