est: add chip selectors to set_wire_rc synopsis in README

Signed-off-by: Eder Monteiro <emrmonteiro@precisioninno.com>

Author: eder-matheus

src/est/README.md

@@ -15,6 +15,9 @@ The `set_wire_rc` command sets the resistance and capacitance used to estimate
 delay of routing wires.  Separate values can be specified for clock and data
 nets with the `-signal` and `-clock` flags. Without either `-signal` or
 `-clock` the resistance and capacitance for clocks and data nets are set.
+In 3D designs the values can be targeted at specific chips with the `-tech`,
+`-chip` and `-redistribution_layer` selectors; without a selector the values
+are the defaults used by chips that have no chip-specific values.
 
 ```
 # Either run 
@@ -31,13 +34,19 @@ set_wire_rc
     [-data]
     [-corner corner]
     [-layers layers_list]
+    [-tech tech]
+    [-chip chip]
+    [-redistribution_layer]
 
 or 
 set_wire_rc
     [-h_resistance res]
     [-h_capacitance cap]
     [-v_resistance res]
     [-v_capacitance cap]
+    [-tech tech]
+    [-chip chip]
+    [-redistribution_layer]
 
 or
 set_wire_rc 
@@ -46,10 +55,16 @@ set_wire_rc
     [-data]
     [-corner corner]
     [-layer layer_name]
+    [-tech tech]
+    [-chip chip]
+    [-redistribution_layer]
 or 
 set_wire_rc
     [-resistance res]
     [-capacitance cap]
+    [-tech tech]
+    [-chip chip]
+    [-redistribution_layer]
 ```
 
 #### Options