unity: note on tracing powering errors

[bruno-garcia]

I think here we could improve a lot what tracing does for Unith game devs.

That blurb is clearly some copy paste of whatever backend framework this was written for.
Linking to you ur new doc on tracing is also a good opportunity.

@bitsandfoxes Feel free to close this PR and take over if u have more ideas

Relates to: #13516

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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	11.14MB	-9 bytes (-0.0%) ⬇️
sentry-docs-client-array-push	9.47MB	-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	1.75MB	-0.0%
../instrumentation.js	-3 bytes	1.08MB	-0.0%
9523.js	-3 bytes	1.05MB	-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	868.7kB	-0.0%
static/chunks/8165-*.js	-3 bytes	410.1kB	-0.0%
server/middleware-*.js	-5.55kB	1.0kB	-84.74%
server/middleware-*.js	5.55kB	6.55kB	555.3% ⚠️
static/MOPlG4PeN_V9HXvQ2hlg1/_buildManifest.js (New)	578 bytes	578 bytes	100.0% 🚀
static/MOPlG4PeN_V9HXvQ2hlg1/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/4wJ9SqyLEQF8CThTWXbxl/_buildManifest.js (Deleted)	-578 bytes	0 bytes	-100.0% 🗑️
static/4wJ9SqyLEQF8CThTWXbxl/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️