### What changes were proposed in this pull request?
This PR replaces the non-ASCII characters to ASCII characters when possible in PySpark documentation
### Why are the changes needed?
To avoid unnecessarily using other non-ASCII characters which could lead to the issue such as https://github.com/apache/spark/pull/32047 or https://github.com/apache/spark/pull/22782
### Does this PR introduce _any_ user-facing change?
Virtually no.
### How was this patch tested?
Found via (Mac OS):
```bash
# In Spark root directory
cd python
pcregrep --color='auto' -n "[\x80-\xFF]" `git ls-files .`
```
Closes#32048 from HyukjinKwon/minor-fix.
Authored-by: HyukjinKwon <gurwls223@apache.org>
Signed-off-by: Max Gekk <max.gekk@gmail.com>
2ca76a57be