No.9's solution is wrong in 100_Numpy_exercises_with_hints_with_solutions.md file

No.9's solution may be miscopied from No.10's solution.
I suggest the solution should be revised from **Before** to **After**.

## 9. Create a 3x3 matrix with values ranging from 0 to 8 (★☆☆)
`hint: reshape`

**Before**
---
```python
nz = np.nonzero([1,2,0,0,4,0])
print(nz)
```
---

**After**
---
```python
np.arange(0,9).reshape(3,3)
```
---