[BUG] [Chapter2] ValueError when calculating the correlations in corr_matrix = housing.corr()

The following ValueError occurs when calling

`corr_matrix = housing.corr()`

**ValueError: could not convert string to float: 'INLAND'**

Obviously the DataFrame gets confused by the values in "ocean_proximity"

For me the solution was to change the 2 lines were the correlations are calculated to:

`corr_matrix = housing.corr(numeric_only=True)`

According to:

https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.corr.html

The default value of numeric_only for DataFrame.corr() was changed to False effective as of pandas 2.0.0