fix: cos - add MAZ example (#833)

* fix: cos - add MAZ example

* fix: add  versioning_enable = true to MAZ

* update example relative docs

Author: Kagashino

tencentcloud/resource_tc_cos_bucket.go

@@ -12,6 +12,18 @@ resource "tencentcloud_cos_bucket" "mycos" {
 }
 ```
 
+
+Creation of multiple available zone bucket
+
+```hcl
+resource "tencentcloud_cos_bucket" "mycos" {
+  bucket   = "mycos-1258798060"
+  acl      = "private"
+  multi_az = true
+  versioning_enable = true
+}
+```
+
 Using verbose acl
 ```hcl
 resource "tencentcloud_cos_bucket" "with_acl_body" {

website/docs/r/cos_bucket.html.markdown

@@ -22,6 +22,17 @@ resource "tencentcloud_cos_bucket" "mycos" {
 }
 ```
 
+Creation of multiple available zone bucket
+
+```hcl
+resource "tencentcloud_cos_bucket" "mycos" {
+  bucket            = "mycos-1258798060"
+  acl               = "private"
+  multi_az          = true
+  versioning_enable = true
+}
+```
+
 Using verbose acl
 
 ```hcl