[MINOR][DOCS] Remove u prefix for py str #50185
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What changes were proposed in this pull request?
Removed the u prefix from py str in quick-start docs
Why are the changes needed?
spark explicitly states that Python 3.8+ is required.
This annotation is for py2. There is not need to use it in py3. Over the time less people will know this syntax.
Does this PR introduce any user-facing change?
No
How was this patch tested?
Untested
Was this patch authored or co-authored using generative AI tooling?
No