updated synthesis/floorplan/place section in FlowVariables.md

Signed-off-by: Cho Moon <[email protected]>

Author: precisionmoon

docs/user/FlowVariables.md

@@ -256,6 +256,7 @@ configuration file.
 - [MIN_BUF_CELL_AND_PORTS](#MIN_BUF_CELL_AND_PORTS)
 - [SDC_FILE](#SDC_FILE)
 - [SDC_GUT](#SDC_GUT)
+- [SWAP_ARITH_OPERATORS](#SWAP_ARITH_OPERATORS)
 - [SYNTH_BLACKBOXES](#SYNTH_BLACKBOXES)
 - [SYNTH_GUT](#SYNTH_GUT)
 - [SYNTH_HDL_FRONTEND](#SYNTH_HDL_FRONTEND)
@@ -323,6 +324,7 @@ configuration file.
 - [SKIP_LAST_GASP](#SKIP_LAST_GASP)
 - [SKIP_PIN_SWAP](#SKIP_PIN_SWAP)
 - [SKIP_REPORT_METRICS](#SKIP_REPORT_METRICS)
+- [SWAP_ARITH_OPERATORS](#SWAP_ARITH_OPERATORS)
 - [TAPCELL_TCL](#TAPCELL_TCL)
 - [TIEHI_CELL_AND_PORT](#TIEHI_CELL_AND_PORT)
 - [TIELO_CELL_AND_PORT](#TIELO_CELL_AND_PORT)
@@ -347,6 +349,7 @@ configuration file.
 - [PLACE_PINS_ARGS](#PLACE_PINS_ARGS)
 - [ROUTING_LAYER_ADJUSTMENT](#ROUTING_LAYER_ADJUSTMENT)
 - [SKIP_REPORT_METRICS](#SKIP_REPORT_METRICS)
+- [SWAP_ARITH_OPERATORS](#SWAP_ARITH_OPERATORS)
 - [TIE_SEPARATION](#TIE_SEPARATION)
 
 ## cts variables