docs: fix dataplane observability configuration remote write url description

[miguelsorianod]

Description

The documentation was referencing obsolete attribute names in the configuration. This set of changes updates those references to the currently defined names.

Verification Steps

• The YAML sample file is a valid YAML

Checklist (Definition of Done)

• All acceptance criteria specified in JIRA have been completed
• Unit and integration tests added that prove the fix is effective or the feature works (tested against emulated and non-emulated OCM environment)
• Documentation added for the feature
• CI and all relevant tests are passing
• Code Review completed
• Verified independently by reviewer
• All PR comments are resolved either by addressing them or creating follow up tasks
• Required metrics/dashboards/alerts have been added (or PR created).
• Required Standard Operating Procedure (SOP) is added.
• JIRA has been created for changes required on the client side

[miguelsorianod]

cc @pb82 @machi1990 can you review that I documented it properly and that I am not "swapping" the behavior?

Thank you

[codecov]

Codecov Report

Merging #1714 (26a86b4) into main (7e9dd15) will decrease coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1714      +/-   ##
==========================================
- Coverage   82.19%   82.19%   -0.01%     
==========================================
  Files         161      161              
  Lines       14999    14997       -2     
==========================================
- Hits        12329    12327       -2     
  Misses       2235     2235              
  Partials      435      435              

Flag	Coverage Δ
unittests	82.19% <ø> (-0.01%)	⬇️

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see 3 files with indirect coverage changes