Fix typo in metric name of monitoring doc

[Fluxx]

Description

There was a typo in the mention of the otecol_exporter_sent_spans metric. The l character was missing, and it should be otelcol_exporter_sent_spans

[linux-foundation-easycla]

• ✅ login: TylerHelmuth / name: Tyler Helmuth (d55ca10)
• ❌ - login: @Fluxx / name: Jeff Pollard . The commit (7158d8a) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

[codeboten]

Thanks @Fluxx, please sign the CLA and we can get this merged!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.67%. Comparing base (c5ee52b) to head (d55ca10).
Report is 50 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10083   +/-   ##
=======================================
  Coverage   91.67%   91.67%           
=======================================
  Files         362      362           
  Lines       16754    16754           
=======================================
  Hits        15359    15359           
  Misses       1056     1056           
  Partials      339      339           

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[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.