docs(python): Add documentation for the Python SDK Async Transport

[srothh]

DESCRIBE YOUR PR

Add documentation for the new experimental Python SDK Async Transport option.

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EXTRA RESOURCES

• Sentry Docs contributor guide

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 6, 2025 11:55am

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
develop-docs	⬜️ Ignored (Inspect)			Aug 6, 2025 11:55am

[codecov]

Bundle Report

Changes will increase total bundle size by 6.79kB (0.03%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-client-array-push	9.85MB	-6 bytes (-0.0%) ⬇️
sentry-docs-server-cjs	12.37MB	6.8kB (0.06%) ⬆️

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	1.77MB	-0.0%
../instrumentation.js	-3 bytes	1.1MB	-0.0%
9523.js	-3 bytes	1.08MB	-0.0%
../app/[[...path]]/page.js.nft.json	2.27kB	740.94kB	0.31%
../app/platform-redirect/page.js.nft.json	2.27kB	740.86kB	0.31%
../app/sitemap.xml/route.js.nft.json	2.27kB	738.33kB	0.31%

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	882.71kB	-0.0%
static/chunks/8321-*.js	-3 bytes	425.87kB	-0.0%
server/middleware-*.js	5.55kB	6.55kB	555.3% ⚠️
server/middleware-*.js	-5.55kB	1.0kB	-84.74%
static/5ndwpM79vY37JkqRTSDab/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/5ndwpM79vY37JkqRTSDab/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/W84V3ihBRYEI689c0Du_w/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/W84V3ihBRYEI689c0Du_w/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️