Update 01-CA_and_prerequisite.md

fix json格式错误

docs/setup/01-CA_and_prerequisite.md

@@ -27,29 +27,27 @@ kubernetes 系统各组件需要使用 TLS 证书对通信进行加密，使用
 #### 创建 CA 配置文件 [ca-config.json.j2](../../roles/deploy/templates/ca-config.json.j2)
 ``` bash
 {
-  "signing": {
-    "default": {
-      "expiry": "{{ CERT_EXPIRY }}"
+    "signing":{
+        "default":{
+            "expiry":"{{ CERT_EXPIRY }}"
         },
-    "profiles": {
-      "kubernetes": {
-        "usages": [
+        "profiles":{
+            "kubernetes":{
+                "usages":[
                     "signing",
                     "key encipherment",
                     "server auth",
                     "client auth"
                 ],
-        "expiry": "{{ CERT_EXPIRY }}"
-      }
+                "expiry":"{{ CERT_EXPIRY }}"
             },
-    "profiles": {
-      "kcfg": {
-        "usages": [
+            "kcfg":{
+                "usages":[
                     "signing",
                     "key encipherment",
                     "client auth"
                 ],
-        "expiry": "{{ CUSTOM_EXPIRY }}"
+                "expiry":"{{ CUSTOM_EXPIRY }}"
             }
         }
     }