bench: fix the typo in the error message of bench command

[Mini256]

What problem does this PR solve?

Fix the typo in the error message of bench command.

What is changed and how it works?

s/pleae/please/

Check List

Tests

• Manual test (add detailed scripts or steps below)

make
./bin/tiup-bench tpcc run

Code changes

None

Side effects

None

Release notes:

NONE

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• nexustar

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[codecov-commenter]

Codecov Report

Merging #1824 (a233bb3) into master (4166dfb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1824   +/-   ##
=======================================
  Coverage   53.00%   53.00%           
=======================================
  Files         303      303           
  Lines       34663    34663           
=======================================
  Hits        18372    18372           
  Misses      14142    14142           
  Partials     2149     2149           

Flag	Coverage Δ
tiup	14.39% <ø> (ø)
unittest	21.29% <ø> (ø)

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[nexustar]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: a233bb3