space after commas

And add a note indicating that until the general Ellipse is supported, an Expr is returned for the Ellipse with a non-horizontal axis.

And there must be something wrong with the calculation:

```
>>> e1,e2=solve(eq,y)
>>> eq
(-40*x/41 + 9*y/41 + 364/41)**2/9 + (27*x/41 + 120*y/41 + 111/41)**2/9
>>> e1
-320*x/1609 - 41*sqrt(-(41*x - 347)**2)/4827 - 1844/1609
```

e1 will always be imaginary (which means there is no value of x that will have a corresponding real value of y...so the answer must have gone wrong somewhere.