feat (native): update transport proxy docs

[JoshuaMoelans]

DESCRIBE YOUR PR

Updated the section on proxy support to match the upcoming socks5 proxy support feature in sentry-native.

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[codecov[bot]]

Bundle Report

Changes will increase total bundle size by 827 bytes (0.0%) :arrow_up:. This is within the configured threshold :white_check_mark:

Detailed changes

| Bundle name | Size | Change | | ----------- | ---- | ------ | | sentry-docs-server-cjs | 10.28MB | 804 bytes (0.01%) :arrow_up: | | sentry-docs-client-array-push | 9.29MB | 23 bytes (0.0%) :arrow_up: |