Remove notes on deprecated Batch size

[wild-endeavor]

Just removing docs referencing the Batch size construct that was removed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.99%. Comparing base (2a7d363) to head (6315db4).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6102   +/-   ##
=======================================
  Coverage   36.98%   36.99%           
=======================================
  Files        1318     1318           
  Lines      132406   132406           
=======================================
+ Hits        48974    48980    +6     
+ Misses      79179    79173    -6     
  Partials     4253     4253           

Flag	Coverage Δ
unittests-datacatalog	51.58% <ø> (ø)
unittests-flyteadmin	54.10% <ø> (+0.02%)	⬆️
unittests-flytecopilot	30.99% <ø> (ø)
unittests-flytectl	62.29% <ø> (ø)
unittests-flyteidl	7.23% <ø> (ø)
unittests-flyteplugins	53.82% <ø> (ø)
unittests-flytepropeller	42.60% <ø> (ø)
unittests-flytestdlib	55.18% <ø> (ø)

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