Update README.md with latest layer language

[cuevasm]

Updating L2 language in readme

Description

Applicable issues

• fixes #

Additional info (benefits, drawbacks, caveats)

Checklist

• Test coverage for new or modified code paths
• Changelog is updated
• Required documentation changes (e.g., docs/rpc/openapi.yaml and rpc-endpoints.md for v2 endpoints, event-dispatcher.md for new events)
• New clarity functions have corresponding PR in clarity-benchmarking repo
• New integration test(s) added to bitcoin-tests.yml

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6d0effc) 0.18% compared to head (5503069) 0.18%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4019   +/-   ##
=======================================
  Coverage    0.18%    0.18%           
=======================================
  Files         301      301           
  Lines      276654   276654           
=======================================
  Hits          512      512           
  Misses     276142   276142           

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[wileyj]

shipit