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docs: Docs buffer overrun improvement (#3986)

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docs/troubleshooting.md
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@ -84,9 +84,35 @@ client only 1 Gbit/s or Wi-Fi. Similarly, a 1 Gbps host may be too fast for a
client having only a 100 Mbps interface.
As a workaround the transmission speed of the host NIC can be reduced: 1 Gbps
instead of 2.5 or 100 Mbps instead of 1 Gbps. (A technically more advanced
instead of 2.5 or 100 Mbps instead of 1 Gbps. A technically more advanced
solution would be to configure traffic shaping rules at the OS-level, so that
only Sunshine's traffic is slowed down.)
only Sunshine's traffic is slowed down.
Such a solution on Linux could look like that:
```bash
# 1) Remove existing qdisc (pfifo_fast)
sudo tc qdisc del dev <NIC> root
# 2) Add HTB root qdisc with default class 1:1
sudo tc qdisc add dev <NIC> root handle 1: htb default 1
# 3) Create class 1:1 for full 10 Gbit/s (all other traffic)
sudo tc class add dev <NIC> parent 1: classid 1:1 htb \
rate 10000mbit ceil 10000mbit burst 32k
# 4) Create class 1:10 for Sunshine game stream at 1 Gbit/s
sudo tc class add dev <NIC> parent 1: classid 1:10 htb \
rate 1000mbit ceil 1000mbit burst 32k
# 5) Filter UDP source port 47998 into class 1:10
sudo tc filter add dev <NIC> protocol ip parent 1: prio 1 \
u32 match ip protocol 17 0xff \
match ip sport 47998 0xffff flowid 1:10
```
In that way only the Sunshine traffic is limited by 1 Gbit. This is not persistent on reboots.
If you use a different port for the game stream you need to adjust the last command.
Sunshine versions > 0.23.1 include improved networking code that should
alleviate or even solve this issue (without reducing the NIC speed).