WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match

Docker reports the following warnings:

In `OracleDatabase/SingleInstance/dockerfiles/19.3.0/Dockerfile`:
```
#1 WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 25)
```

In `OracleDatabase/SingleInstance/dockerfiles/23.9.0/Containerfile.free`:
```
#1 WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 21)
```
