Upon --replace, suggest --modify-body / --modify-headers
Upon --replace, suggest --modify-body / --modify-headers

Else the user sees
```
--replace is deprecated.
Please use `--replacements` instead.
mitmdump: error: unrecognized arguments: --replace
```
and then
```
mitmdump: error: unrecognized arguments: --replacements
--replacements is deprecated.
Please use `--modify-body` or `--modify-headers` instead.
```
and feels silly

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