docs(cli): Remove Proguard release association mention

[szokeasaurusrex]

We are removing the association between ProGuard files and releases. The association is already no longer visible in Sentry, and the CLI arguments to specify an associated release will be deprecated in the next version of Sentry CLI.

Resolves #15229
Resolves DOCS-2317

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
sentry-docs	Ready	Preview	Comment	Oct 15, 2025 2:56pm

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
develop-docs	Ignored	Preview		Oct 15, 2025 2:56pm

[linear]

DOCS-2317 [CLI docs] Remove any mentions of deprecated ProGuard flags

[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-client-array-push	10.16MB	-6 bytes (-0.0%) ⬇️
sentry-docs-server-cjs	12.98MB	-9 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%
static/_iKS3sknab43H067wkopG/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/_iKS3sknab43H067wkopG/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/DENQn3_a-*.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️
static/DENQn3_a-*.js (Deleted)	-684 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%