fix(plex): Adjust input validation for comma separated list (#3430)

charts/stable/plex/docs/validation.md

@@ -1,15 +1,25 @@
 # Input Validation
 
 **`Advertise IP`**
+
+Accepts:
+
+- `http://` or `https://`
+- IP or DNS host
+- Port is optional
+- `,` Separated
+
 Accepted formats are:
 
 - `https://192.168.1.100:32400`
 - `https://192.168.1.100:32400`
-- `http://dnsname:32400`
-- `https://dnsname:32400`
+- `http://dnshost:32400`
+- `https://dnshost:32400`
+- `https://dnshost`
+- `https://dnshost,http://192.168.1.100:32400`
 
-Regex used to match this: `^http(s)?:\/\/.*:\d*$`
-You can try live [here](https://regex101.com/r/3ehGWY/1)
+Regex used to match this: `^(http(s)?:\/\/([a-z0-9.]*)(:\d{0,5})?,?)*$`
+You can try live [here](https://regex101.com/r/9GBtUh/1)
 
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