Use new platform auth configuration property (#976)

Author: philipliu

platforms/anchor-platform/admin-guide/component/security/api_key.mdx

@@ -4,7 +4,7 @@ To enable API key authentication, modify your `dev.env` file:
 
 ```bash
 # dev.env
-PLATFORM_SERVER_AUTH_TYPE=api_key
+PLATFORM_API_AUTH_TYPE=api_key
 # Will be used as API key
 SECRET_PLATFORM_API_AUTH_SECRET="your API key that business server will use"
 ```

platforms/anchor-platform/admin-guide/component/security/jwt.mdx

@@ -4,7 +4,7 @@ To enable JWT authentication, modify your `dev.env` file:
 
 ```bash
 # dev.env
-PLATFORM_SERVER_AUTH_TYPE=jwt
+PLATFORM_API_AUTH_TYPE=jwt
 # Will be used to sign the JWT token
 SECRET_PLATFORM_API_AUTH_SECRET="your secret that business server will use"
 ```