Add HTTP post port mapping to docker command

[albertteoh]

Which problem is this PR solving?

• Resolves Hotrod api/traces displaying connecting refused #4356

Short description of the changes

• The HotRod example emits spans on jaeger-collector's HTTP endpoint.
• This exposes the port being listened to for spans over the HTTP endpoint to fix an error in the HotRod example.
• A minor typo is also fixed.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.01 🎉

Comparison is base (6119406) 97.07% compared to head (a2990bd) 97.08%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4407      +/-   ##
==========================================
+ Coverage   97.07%   97.08%   +0.01%     
==========================================
  Files         300      300              
  Lines       17730    17730              
==========================================
+ Hits        17211    17214       +3     
+ Misses        417      415       -2     
+ Partials      102      101       -1     

Flag	Coverage Δ
unittests	97.08% <ø> (+0.01%)	⬆️

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see 1 file with indirect coverage changes

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