docs: account_id param for newrelic_one_dashboard_json

[asweet-confluent]

Description

This PR adds documentation for the optional account_id argument to newrelic_one_dashboard_json. This parameter is already documented in the other two dashboard resources, I just copied the documentation from there.

Type of change

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• This change requires a documentation update

Checklist:

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• My commit message follows conventional commits

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[codecov-commenter]

Codecov Report

Merging #2385 (b0bd628) into main (a1c810d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2385   +/-   ##
=======================================
  Coverage   33.97%   33.97%           
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  Files          91       91           
  Lines       24753    24753           
=======================================
  Hits         8409     8409           
  Misses      16192    16192           
  Partials      152      152           

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[pranav-new-relic]

@asweet-confluent thank you for the contribution. Merging this PR.