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add additional document on flat router
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doc/src/vpr/command_line_usage.rst

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@@ -1124,6 +1124,7 @@ VPR uses a negotiated congestion algorithm (based on Pathfinder) to perform rout
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If this option is enabled, the *run-flat* router is used instead of the *two-stage* router.
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This means that during the routing stage, all nets, both intra- and inter-cluster, are routed directly from one primitive pin to another primitive pin.
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This increases routing time but can improve routing quality by re-arranging LUT inputs and exposing additional optimization opportunities in architectures with local intra-cluster routing that is not a full crossbar.
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**Default:** ``OFF`
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