Add timeout to perf_buffer_poll docs
@@ -1244,10 +1244,12 @@ Normal output from a BPF program is either:
### 1. perf_buffer_poll()
-Syntax: ```BPF.perf_buffer_poll()```
+Syntax: ```BPF.perf_buffer_poll([timeout])```
This polls from all open perf ring buffers, calling the callback function that was provided when calling open_perf_buffer for each entry.
+The timeout parameter is optional and measured in milliseconds.
+
Example:
```Python
