nbari / pg_exporter / 18917563275

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Clarify --listen help text to explain dual-stack behavior

The previous help text said 'try IPv6, fallback to IPv4' which was
misleading - it made it sound like it would ONLY use IPv6 and only
fall back to IPv4 if IPv6 failed.

The reality is that binding to [::] (IPv6 all interfaces) accepts
BOTH IPv6 and IPv4 connections on dual-stack systems through
IPv4-mapped IPv6 addresses.

Updated help text now clearly states:
- Default binds to [::]:port which accepts BOTH IPv6 and IPv4
- Only falls back to 0.0.0.0:port if IPv6 is unavailable
- Added note explaining IPv4-mapped IPv6 addresses on dual-stack

Short help: 'default: [::]:port, accepts both IPv6 and IPv4'
Long help: Detailed explanation of dual-stack behavior

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