支持更灵活的使用方式,也是为了保证所有 ovn eip 的底层基本逻辑代码都一致

[zbb88888]

• Make sure you have followed the Document Convention

[gemini-code-assist]

Summary of Changes

Hello @zbb88888, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在通过更新 EIP 和 SNAT 功能的文档，提升用户配置的灵活性和清晰度。主要改动包括调整文档结构，将高级配置信息提前，并引入一个新的配置项 external-gw-switch，使用户能够更灵活地管理底层网络资源，确保所有 OVN EIP 的底层逻辑一致性。

Highlights

• 文档结构优化: 将 EIP 和 SNAT 功能的“高级配置”部分前移，使其更易于发现和理解，提升了文档的清晰度。
• 新增配置选项: 引入并详细解释了 external-gw-switch 配置项，允许用户复用现有的 underlay subnet 逻辑交换机，从而提供更灵活的网络配置方式。
• 配置示例更新: 在 ovn-external-gw-config Configmap 示例中，添加了 external-gw-switch 的注释行，以指导用户如何使用此新功能。

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[gemini-code-assist]

Code Review

此 PR 主要更新了 eip-snat 的中英文文档，将“高级配置”部分移至文档靠前位置，并增加了关于 external-gw-switch 配置项的说明，以支持更灵活的 OVN EIP 使用方式。整体上，这些改动提高了文档的清晰度和完整性。我发现了一些可以改进的地方，主要涉及文档中的拼写错误和表述清晰度问题，具体请见我的评论。

[gemini-code-assist]

这两行内容有些冗余，措辞可以更直接清晰。建议将它们合并成一个更简洁的句子，以提高可读性。

Suggested change

	> To support this feature, if you need to directly specify a default external subnet name, you may need to set startup arguments for kube-ovn-controller.
	Some args of `kube-ovn-controller` allow for advanced configuration of SNAT and EIP:
	> To support advanced configuration of SNAT and EIP, such as specifying a default external subnet, set the following startup arguments for `kube-ovn-controller`:

[gemini-code-assist]

external-gw-switch 的描述可以更清晰一些。术语 "the others" 含义模糊，明确列出可以省略哪些参数会更有帮助。此外，可以改进句子结构以提高可读性。

Suggested change

- `external-gw-switch`: Reuse the name of an existing underlay subnet logical switch. If you are using the default external of `--external-gateway-net`, then this value is omitted. But if you want to reuse an existing underlay subnet CR, then you can just configure `external-gw-switch: "your-subnet-name"`, and the others can be left unconfigured, because the network has already been maintained through the underlay subnet.

- `external-gw-switch`: Reuse an existing underlay subnet logical switch. If you are using the default external switch specified by `--external-gateway-net` (default is "external"), you don't need to set this. However, if you want to reuse an existing underlay subnet CR, you can configure `external-gw-switch: "your-subnet-name"`. In this case, other parameters like `external-gw-nodes`, `external-gw-nic`, `external-gw-addr`, `nic-ip`, and `nic-mac` can be omitted, as the network is already managed by the underlay subnet.

[gemini-code-assist]

文档中存在一个拼写错误，指定定一个 应为 指定一个。建议修正以提高文档的可读性。

Suggested change

	> 为了支持该功能，如果你需要直接指定定一个默认的 external subnet 名，你可能需要设置 `kube-ovn-controller` 的启动参数。
	> 为了支持该功能，如果你需要直接指定一个默认的 external subnet 名，你可能需要设置 `kube-ovn-controller` 的启动参数。

[gemini-code-assist]

这段描述中“其他的”指代不够明确，可能会让用户感到困惑。建议明确指出哪些配置项可以省略，并优化句子结构以提高清晰度。

Suggested change

	- `external-gw-switch`: 复用已有的 underlay subnet 逻辑交换机名称，如果使用的是`--external-gateway-net`默认的 external，那么该值是缺省的。但如果你想复用已有的 underlay subnet CR， 那么你可以只配置 external-gw-switch: "your-subnet-name"，其他的都可以不用配置，因为网络已经通过 underlay subnet 维护好了。
	- `external-gw-switch`: 复用一个已有的 underlay subnet 逻辑交换机。如果使用由 `--external-gateway-net` 参数指定的默认外部交换机（默认为 "external"），则无需配置此项。但如果你想复用一个已有的 underlay subnet CR，可以只配置 `external-gw-switch: "your-subnet-name"`，此时 `external-gw-nodes`、`external-gw-nic`、`external-gw-addr`、`nic-ip` 和 `nic-mac` 等参数可以省略，因为网络已由 underlay subnet 维护。