doc: update ansible.md
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		@@ -47,7 +47,7 @@ ansible --version | grep "config file"
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`/etc/ansible/hosts`
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```INI
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```ini
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mail.example.com
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[webservers]
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@@ -57,7 +57,7 @@ bar.example.com
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### Inventory 主机组使用多个IP和域名
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```
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```ini
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[web]
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172.18.12.5[1:4]
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[webservers]
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