Improve doc/i2p.md regarding I2P router options/versions

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@ -10,11 +10,22 @@ started with I2P terminology.
## Run Bitcoin Core with an I2P router (proxy)
A running I2P router (proxy) with [SAM](https://geti2p.net/en/docs/api/samv3)
enabled is required (there is an [official one](https://geti2p.net) and
[a few alternatives](https://en.wikipedia.org/wiki/I2P#Routers)). Notice the IP
address and port the SAM proxy is listening to; usually, it is
`127.0.0.1:7656`. Once it is up and running with SAM enabled, use the following
Bitcoin Core options:
enabled is required. Options include:
- [i2prouter (I2P Router)](https://geti2p.net), the official implementation in
Java
- [i2pd (I2P Daemon)](https://github.com/PurpleI2P/i2pd)
([documentation](https://i2pd.readthedocs.io/en/latest)), a lighter
alternative in C++ (successfully tested with version 2.23 and up; version 2.36
or later recommended)
- [i2p-zero](https://github.com/i2p-zero/i2p-zero)
- [other alternatives](https://en.wikipedia.org/wiki/I2P#Routers)
Note the IP address and port the SAM proxy is listening to; usually, it is
`127.0.0.1:7656`.
Once an I2P router with SAM enabled is up and running, use the following Bitcoin
Core configuration options:
```
-i2psam=<ip:port>