chore(python): Rename start_span parameter

[sentrivana]

We'll be changing the name of this parameter, updating.

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PRE-MERGE CHECKLIST

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• Checked Vercel preview for correctness, including links
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[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
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[codecov]

Bundle Report

Changes will decrease total bundle size by 22.19kB (-0.1%) ⬇️. 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	12.31MB	-22.18kB (-0.18%) ⬇️

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	882.81kB	-0.0%
static/chunks/8321-*.js	-3 bytes	425.87kB	-0.0%
static/McvhsJcD4z9VXZanuvmTP/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/McvhsJcD4z9VXZanuvmTP/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/zbcfACmpn6qTm301KGUqW/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/zbcfACmpn6qTm301KGUqW/_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	1.77MB	-0.0%
../instrumentation.js	-3 bytes	1.1MB	-0.0%
9523.js	-3 bytes	1.08MB	-0.0%
../app/[[...path]]/page.js.nft.json	-7.39kB	725.77kB	-1.01%
../app/platform-redirect/page.js.nft.json	-7.39kB	725.68kB	-1.01%
../app/sitemap.xml/route.js.nft.json	-7.39kB	723.15kB	-1.01%

[sentrivana]

Will merge as soon as we release the change (in the next alpha)