Update metrics usage documentation for Python

[nikolovlazar]

The Python Metrics Usage section text had a leftover sentence from when Metrics used to be an experimental feature. I've changed the wording so it doesn't confuse users to think they still need to enable the feature somehow.

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
sentry-docs	Ready	Preview	Comment	Nov 20, 2025 5:10pm

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
develop-docs	Ignored	Preview		Nov 20, 2025 5:10pm

[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	12.98MB	-9 bytes (-0.0%) ⬇️
sentry-docs-client-array-push	10.18MB	-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	1.74MB	-0.0%
../instrumentation.js	-3 bytes	1.07MB	-0.0%
9523.js	-3 bytes	1.04MB	-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	882.71kB	-0.0%
static/chunks/8321-*.js	-3 bytes	425.87kB	-0.0%
static/qOF4mHIoWgwwmBQwNRuyF/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/qOF4mHIoWgwwmBQwNRuyF/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/kY02iC8Q55sH6yVbnffpd/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/kY02iC8Q55sH6yVbnffpd/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️