[zh] Sync en docs in docs/concepts/_index.md (#11245)
[zh] Sync en docs in docs/concepts/_index.md (#11245)

[zh] Sync en docs in docs/concepts/_index.md
istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io