Add SIGINFO to documentation (puma#2762)

The feature was added in puma#1320 but was missing from documentation.
JuanitoFatas · Sep 9, 2022 · 1c539d1 · 1c539d1
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commit 1c539d1
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diff --git a/docs/signals.md b/docs/signals.md
@@ -42,6 +42,7 @@ Puma cluster responds to these signals:
 - `INT ` equivalent of sending Ctrl-C to cluster. Puma will attempt to finish then exit.
 - `CHLD`
 - `URG ` refork workers in phases from worker 0 if `fork_workers` option is enabled.
+- `INFO` print backtraces of all puma threads
 
 ## Callbacks order in case of different signals