Update signals runtime readme

[silesky]

After speaking to didier, felt that this was needed

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4ca88ce

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.75%. Comparing base (7c24459) to head (4ca88ce).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1249      +/-   ##
==========================================
+ Coverage   77.06%   82.75%   +5.68%     
==========================================
  Files         139      169      +30     
  Lines        3249     4836    +1587     
  Branches      690     1102     +412     
==========================================
+ Hits         2504     4002    +1498     
- Misses        745      834      +89     

Flag	Coverage Δ
browser	92.22% <ø> (?)
core	89.86% <ø> (ø)
node	?

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