Outdated docs

The docs living here seems to be outdated:
https://github.com/microsoft/Docker.DotNet

E.g.
```
Stream stream = await client.Images.CreateImageAsync(
new ImagesCreateParameters
{
Parent = "fedora/memcached",
Tag = "alpha",
},
new AuthConfig
{
Email = "test@example.com",
Username = "test",
Password = "pa$$w0rd"
});
```

Current properties of ImagesCreateParameters in 3.125.2.0 seems to be:
* FromImage
* FromSrc
* Repo
* Tag