[SPARK-38487][PYTHON][DOC] Fix docstrings of nlargest/nsmallest of DataFrame
[SPARK-38487][PYTHON][DOC] Fix docstrings of nlargest/nsmallest of DataFrame

### What changes were proposed in this pull request?
Fix docstrings of nlargest/nsmallest of DataFrame

### Why are the changes needed?
To make docstring less confusing.

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?
Manual test.

Closes #35793 from xinrong-databricks/frame.ntop.

Authored-by: Xinrong Meng <f8e847d07d7307743be32495e91478c80c8e0110@databricks.com>
Signed-off-by: Hyukjin Kwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>

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