docs: update hbar-limiter.md with information about OPERATOR plans

[victor-yanev]

Description:

This PR updates the bar-limiter.md doc with information and diagrams about how the total spending limit is managed through the OPERATOR spending plan.

Fixes #3099

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Test Results

 21 files   -  1  309 suites  +20   38m 14s ⏱️ - 8m 50s
611 tests ± 0  600 ✅  -  3  4 💤 ±0  7 ❌ +3 
838 runs  +51  826 ✅ +48  5 💤 +1  7 ❌ +2 

For more details on these failures, see this check.

Results for commit 5e8e9dd. ± Comparison against base commit 88dd213.

This pull request removes 1 and adds 1 tests. Note that renamed tests count towards both.

"before all" hook for "should associate to a token" ‑ RPC Server Acceptance Tests Acceptance tests @tokencreate HTS Precompile Token Create Acceptance Tests "before all" hook for "should associate to a token"

"before each" hook for "should execute "eth_getStorageAt" request to get current state changes" ‑ RPC Server Acceptance Tests Acceptance tests @api-batch-2 RPC Server Acceptance Tests "before each" hook for "should execute "eth_getStorageAt" request to get current state changes"

♻️ This comment has been updated with latest results.

[quiet-node]

You might want to point this PR to the OPEATOR ticket for the PR Label and Milestone Check CI to pass

[quiet-node]

Nice I like the wordings! LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.96%. Comparing base (c006489) to head (5e8e9dd).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3338      +/-   ##
==========================================
+ Coverage   84.79%   84.96%   +0.16%     
==========================================
  Files          69       69              
  Lines        4637     4655      +18     
  Branches     1041     1042       +1     
==========================================
+ Hits         3932     3955      +23     
+ Misses        398      396       -2     
+ Partials      307      304       -3     

Flag	Coverage Δ
config-service	98.14% <ø> (ø)
relay	78.75% <ø> (+0.02%)	⬆️
server	83.28% <ø> (ø)
ws-server	36.66% <ø> (ø)

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see 4 files with indirect coverage changes