feat(replay): Add a note about bulk-deleting replays

[ryan953]

This new note appears on product/explore/session-replay/web/replay-page-and-filters/ (prod link)
There's also a page about replay details, which already mentions individual replay deletions, so i didn't touch that: https://docs.sentry.io/product/explore/session-replay/web/replay-details/

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
sentry-docs	Canceled			Aug 25, 2025 6:46pm

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
develop-docs	Ignored	Preview		Aug 25, 2025 6:46pm

[codecov]

Bundle Report

Changes will increase total bundle size by 5.11kB (0.02%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-client-array-push	9.9MB	-6 bytes (-0.0%) ⬇️
sentry-docs-server-cjs	12.46MB	5.11kB (0.04%) ⬆️

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	1.78MB	-0.0%
../instrumentation.js	-3 bytes	1.1MB	-0.0%
9523.js	-3 bytes	1.08MB	-0.0%
../app/[[...path]]/page.js.nft.json	1.71kB	758.13kB	0.23%
../app/platform-redirect/page.js.nft.json	1.71kB	758.05kB	0.23%
../app/sitemap.xml/route.js.nft.json	1.71kB	755.52kB	0.23%

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	1.0kB	-84.74%
server/middleware-*.js	5.55kB	6.55kB	555.3% ⚠️
static/ZkWeE0fZBnpcD7dVfB9Pa/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/ZkWeE0fZBnpcD7dVfB9Pa/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/4vR2755Ou4xmE14Qu2_65/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/4vR2755Ou4xmE14Qu2_65/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️