[docs] updated ycsb commands

[aishwarya24]

resolves #14006
@mrajcevic01 , I have removed the maxexecutiontime as per your suggestion.

@netlify /preview/benchmark/ycsb-ysql/#6-run-individual-workloads-optional

• Updated all the files with the note and general edits to maintain consistency in preview, stable, 2.12, and 2.8.

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[mrajcevic01]

Looks good. Do you think we should still add a disclaimer about the fact that recordcount will need to match the number of rows in the table? Removing maxexecutiontime helps users avoid the issue but they can still run into it.

[aishwarya24]

@mrajcevic01 - Yes I have added it as well. Please let me know if this fine. Ill copy it to other files as well. Thanks!

[mrajcevic01]

I think we should put this note in the next section Run the workload as follows: since that is when the user would run into issues. During the load stage we are just inserting data. This note is specific to once the data has been loaded and before one of the actual workloads is run

[ddhodge]

LGTM