Sets the [`RawDescriptionHelpFormatter`](https://docs.python.org/3/library/argparse.html#argparse.RawDescriptionHelpFormatter)
as `formatter_class` for the command parser. This makes argparse respect
the newlines in the command descriptions and showing them in the cli
with `-h` looks better by representing the same formatting as in source.
E.g. `serialize -h` before:
```
usage: run_electrum serialize [-h] jsontx
Create a signed raw transaction from a json tx template. Example value for "jsontx" arg: { "inputs": [ {"prevout_hash":
"9d221a69ca3997cbeaf5624d723e7dc5f829b1023078c177d37bdae95f37c539", "prevout_n": 1, "value_sats": 1000000, "privkey":
"p2wpkh:cVDXzzQg6RoCTfiKpe8MBvmm5d5cJc6JLuFApsFDKwWa6F5TVHpD"} ], "outputs": [ {"address": "tb1q4s8z6g5jqzllkgt8a4har94wl8tg0k9m8kv5zd", "value_sats":
990000} ] } :
positional arguments:
jsontx Transaction in json
options:
-h, --help show this help message and exit
Run 'electrum -h to see the list of global options
```
after this patch:
```
usage: run_electrum serialize [-h] jsontx
Create a signed raw transaction from a json tx template.
Example value for "jsontx" arg: {
"inputs": [
{"prevout_hash": "9d221a69ca3997cbeaf5624d723e7dc5f829b1023078c177d37bdae95f37c539", "prevout_n": 1,
"value_sats": 1000000, "privkey": "p2wpkh:cVDXzzQg6RoCTfiKpe8MBvmm5d5cJc6JLuFApsFDKwWa6F5TVHpD"}
],
"outputs": [
{"address": "tb1q4s8z6g5jqzllkgt8a4har94wl8tg0k9m8kv5zd", "value_sats": 990000}
]
}
:
positional arguments:
jsontx Transaction in json
options:
-h, --help show this help message and exit
Run 'electrum -h to see the list of global options
```
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