Fix missing spaces in os.walk example

[BruceLee569]

In the example of os.walk, a space is required between each sentence to distinguish words.

[the-knights-who-say-ni]

Hello, and thanks for your contribution!

I'm a bot set up to make sure that the project can legally accept this contribution by verifying everyone involved has signed the PSF contributor agreement (CLA).

Recognized GitHub username

We couldn't find a bugs.python.org (b.p.o) account corresponding to the following GitHub usernames:

@BruceLee569

This might be simply due to a missing "GitHub Name" entry in one's b.p.o account settings. This is necessary for legal reasons before we can look at this contribution. Please follow the steps outlined in the CPython devguide to rectify this issue.

You can check yourself to see if the CLA has been received.

Thanks again for the contribution, we look forward to reviewing it!

[github-actions]

This PR is stale because it has been open for 30 days with no activity.

[JelleZijlstra]

I'd suggest retitling the PR to "Fix missing spaces in os.walk example"

[JelleZijlstra]

Planning to merge in a few days (cc @gvanrossum, another trivial docs fix).

[gvanrossum]

I'm not big on fixing typos in comments/docstrings (they tend to generate a lot of review noise for very little payback), and the fix here is unrelated to the point of the example. Then again, the damage is already done. I just hope that the contributor fixes something more significant in their next contribution.

[terryjreedy]

I agree that buggy code should be fixed even in docstring and that this does not need CLA. Please merge when CLA passes so we are done with this.