[document] add router_profiler_astar_fac to command line doc

Author: amin1377

doc/src/vpr/command_line_usage.rst

@@ -1298,6 +1298,13 @@ The following options are only valid when the router is in timing-driven mode (t
 
     **Default:** ``1.2``
 
+.. option:: --router_profiler_astar_fac <float>
+    Controls the directedness of the timing-driven router's exploration when doing router delay profiling. 
+    The router delay profiling step is currently used to calculate the place delay matrix lookup.
+    Values between 1 and 2 are resonable; higher values trade some quality for reduced run-time.
+
+    **Default:** ``1.2``
+
 .. option:: --max_criticality <float>
 
     Sets the maximum fraction of routing cost that can come from delay (vs. coming from routability) for any net.

vpr/src/base/read_options.cpp

@@ -1889,7 +1889,7 @@ argparse::ArgumentParser create_arg_parser(const std::string& prog_name, t_optio
             "What algorithm should be used to compute the place delta matrix.\n"
             "\n"
             " * astar : Find delta delays between OPIN's and IPIN's using\n"
-            "           the router with the current --astar_fac.\n"
+            "           the router with the current --router_profiler_astar_fac.\n"
             " * dijkstra : Use Dijkstra's algorithm to find all shortest paths \n"
             "              from sampled OPIN's to all IPIN's.\n")
         .default_value("astar")