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update caravel STA instructions in `README.md`

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scripts/README.md
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@ -41,7 +41,7 @@ optional arguments:
-a, --all run all checks
````
### How to run Caravel top-level STA including user project wrapper
1. edit in [pt_sta.tcl](https://github.com/efabless/caravel/blob/caravel_redesign/scripts/pt_sta.tcl#L69) the spef mapping section to add the user project module instantiated in user project wrapper
1. edit in [spef_mapping.tcl](./spef_mapping.tcl#L3) to add mapping of the modules instantiated in user_project_wrapper/user_analog_project_wrapper to their `spef`. this is required to enable hierarchical parasitic annotation.
2. run the command
````
python3 signoff_automation.py -d caravel -sta