Add note about server-side tunneling with JS

[AbhiPrasad]

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Based on a suggestion from getsentry/sentry-javascript#15826

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[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 27, 2025 4:14pm

2 Skipped Deployments

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[codecov]

Bundle Report

Changes will decrease total bundle size by 15 bytes (-0.0%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	10.6MB	-9 bytes (-0.0%) ⬇️
sentry-docs-client-array-push	9.43MB	-6 bytes (-0.0%) ⬇️

Affected Assets, Files, and Routes:

view changes for bundle: sentry-docs-server-cjs

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
1729.js	-3 bytes	1.58MB	-0.0%
../instrumentation.js	-3 bytes	910.48kB	-0.0%
9523.js	-3 bytes	886.53kB	-0.0%

view changes for bundle: sentry-docs-client-array-push

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
static/chunks/pages/_app-*.js	-3 bytes	869.5kB	-0.0%
static/chunks/4741-*.js	-3 bytes	394.85kB	-0.0%
static/OXt61ImAV8Mdb3qJZbYip/_buildManifest.js (New)	578 bytes	578 bytes	100.0% 🚀
static/OXt61ImAV8Mdb3qJZbYip/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/lUXKHewwwV8owWFWLeH5G/_buildManifest.js (Deleted)	-578 bytes	0 bytes	-100.0% 🗑️
static/lUXKHewwwV8owWFWLeH5G/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️

[WooWan]

Looks good to me!