ref(browser-extension): Rephrase text around Inbound Filters

[s1gr1d]

DESCRIBE YOUR PR

closes #11479

The section around Inbound Filters was already there but this PR makes the text easier to find by adding a header and giving more explaination.

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[codecov]

Bundle Report

Changes will decrease total bundle size by 13 bytes (-0.0%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	7.45MB	10 bytes (-0.0%) ⬇️
sentry-docs-edge-server-array-push	257.07kB	3 bytes (-0.0%) ⬇️