[pool] Fix ExampleObjectPool output

[ameowlia]

Move the output to the end. If the output comment block is not the last comment block then no checks will be run.

What this PR does / why we need it: Fixes #3763

[CLAassistant]

All committers have signed the CLA.

[codecov[bot]]

Codecov Report

Merging #3928 (70a91b9) into master (70a91b9) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 70a91b9 differs from pull request most recent head 5384784. Consider uploading reports for the commit 5384784 to get more accurate results

@@          Coverage Diff           @@
##           master   #3928   +/-   ##
======================================
  Coverage    56.8%   56.8%           
======================================
  Files         555     555           
  Lines       63373   63373           
======================================
  Hits        36059   36059           
  Misses      24125   24125           
  Partials     3189    3189           

Flag	Coverage Δ
aggregator	62.4% <0.0%> (ø)
cluster	∅ <0.0%> (∅)
collector	58.4% <0.0%> (ø)
dbnode	60.6% <0.0%> (ø)
m3em	46.4% <0.0%> (ø)
metrics	19.7% <0.0%> (ø)
msg	74.7% <0.0%> (ø)

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