endpoints: correct Naver OAuth2 endpoint URLs

[yakkle]

Fixing an incorrect Naver OAuth2 endpoint URLs:

AuthURL : https://developers.naver.com/docs/login/devguide/devguide.md#3-4-2-%EB%84%A4%EC%9D%B4%EB%B2%84-%EB%A1%9C%EA%B7%B8%EC%9D%B8-%EC%97%B0%EB%8F%99-url-%EC%83%9D%EC%84%B1%ED%95%98%EA%B8%B0
TokenURL : https://developers.naver.com/docs/login/devguide/devguide.md#3-4-4-%EC%A0%91%EA%B7%BC-%ED%86%A0%ED%81%B0-%EB%B0%9C%EA%B8%89-%EC%9A%94%EC%B2%AD

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1:

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Message from Seung-min Ryu:

Patch Set 2:

(2 comments)

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Message from Sean Liao:

Patch Set 2: Auto-Submit+1 Code-Review+2 Commit-Queue+1

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Message from Go LUCI:

Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-08-08T17:08:47Z","revision":"280d1bbd09df557b0047a2157063cf12cb6c35cd"}

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Message from Sean Liao:

Patch Set 2: -Commit-Queue

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Patch Set 2:

This CL has passed the run

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Message from Go LUCI:

Patch Set 2: LUCI-TryBot-Result+1

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Message from Dmitri Shuralyov:

Patch Set 2: Code-Review+1

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[gopherbot]

This PR is being closed because golang.org/cl/694235 has been merged.