update command_line_usage.rst to add --place_frequency

Author: soheilshahrouz

doc/src/vpr/command_line_usage.rst

@@ -907,6 +907,16 @@ If any of init_t, exit_t or alpha_t is specified, the user schedule, with a fixe
 
     **Default:** ``auto_bb``
 
+.. option:: --place_frequency {once | always}
+
+    Specifies how often placement is performed during the minimum channel width search.
+
+    ``once``: Placement is run only once at the beginning of the channel width search. This reduces runtime but may not benefit from congestion-aware optimizations.
+
+    ``always``: Placement is rerun for each channel width trial. This might improve routability at the cost of increased runtime.
+
+    **Default:** ``once``
+
 .. option:: --place_chan_width <int>
 
     Tells VPR how many tracks a channel of relative width 1 is expected to need to complete routing of this circuit.
@@ -1869,6 +1879,7 @@ The following options are only valid when the router is in timing-driven mode (t
     **Default:** ``0.5``
 
 .. option:: --router_initial_acc_cost_chan_congestion_weight <float>
+
     Weight applied to the excess channel utilization (above threshold) when computing the initial accumulated cost (acc_cost)of routing resources.
 
     Higher values make the router more sensitive to early congestion.
@@ -1907,7 +1918,7 @@ The following options are only valid when the router is in timing-driven mode (t
 
 .. option:: --router_first_iter_timing_report <file>
 
-    Name of the timing report file to generate after the first routing iteration completes (not generated if unspecfied).
+    Name of the timing report file to generate after the first routing iteration completes (not generated if unspecified).
 
 .. option:: --router_debug_net <int>
 

vpr/src/base/read_options.cpp

@@ -2365,9 +2365,9 @@ argparse::ArgumentParser create_arg_parser(const std::string& prog_name, t_optio
             "Specifies the type of bounding box to be used in 3D architectures.\n"
             "\n"
             "MODE options:\n"
-            "  auto_bb     : Automatically determine the appropriate bounding box based on the connections between layers.\n"
-            "  cube_bb            : Use 3D bounding boxes.\n"
-            "  per_layer_bb     : Use per-layer bounding boxes.\n"
+            "  auto_bb      : Automatically determine the appropriate bounding box based on the connections between layers.\n"
+            "  cube_bb      : Use 3D bounding boxes.\n"
+            "  per_layer_bb : Use per-layer bounding boxes.\n"
             "\n"
             "Choose one of the available modes to define the behavior of bounding boxes in your 3D architecture. The default mode is 'automatic'.")
         .default_value("auto_bb")