fix(analytics): update backend analytics documentation

[constantinius]

Updates the backend analytics documentation.

Closes https://linear.app/getsentry/issue/TET-483/analytics-update-doc-how-to-extend-analytics

Only merge after getsentry/sentry#92943

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
develop-docs	Ready	Preview	Comment	Sep 4, 2025 0:50am
sentry-docs	Ready	Preview	Comment	Sep 4, 2025 0:50am

[sfanahata]

Just a nit that we shouldn't be using slang in our docs, so now would be a good time to clean that up too. But good to go either way.

[codecov]

Bundle Report

Changes will increase total bundle size by 570 bytes (0.0%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-client-array-push	9.91MB	-6 bytes (-0.0%) ⬇️
sentry-docs-server-cjs	12.58MB	576 bytes (0.0%) ⬆️

Affected Assets, Files, and Routes:

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/BXBf8XZHlJ2RqhVvCTeZj/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/BXBf8XZHlJ2RqhVvCTeZj/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/R7MbnyTJjzqklhQ2bldzy/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/R7MbnyTJjzqklhQ2bldzy/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️

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	195 bytes	795.8kB	0.02%
../app/platform-redirect/page.js.nft.json	195 bytes	795.72kB	0.02%
../app/sitemap.xml/route.js.nft.json	195 bytes	793.19kB	0.02%