DOC: Fix Numpy Docstring validation errors in pandas.api.extensions.ExtensionArray
- Related to: https://github.com/pandas-dev/pandas/issues/58539

Fixes docstring issues listed below:
```
   -i "pandas.api.extensions.ExtensionArray.isna SA01" \
   -i "pandas.api.extensions.ExtensionArray.nbytes SA01" \
   -i "pandas.api.extensions.ExtensionArray.ndim SA01" \
   -i "pandas.api.extensions.ExtensionArray.ravel RT03,SA01" \
   -i "pandas.api.extensions.ExtensionArray.take RT03" \
```

Thanks @abhinav-thimma 