remove print_total_cost variable and optimization of docstring format

[lengweiping1983]

Background

1. The print_total_cost global variable is unnecessary, and the existing self.debug variable is directly used in the class.
2. Wrong docstring total_budget parameter.
3. optimization of docstring format.

Changes

1. remove print_total_cost variable
2. optimization of docstring format.

Documentation

Test Plan

PR Quality Checklist

• [x] My pull request is atomic and focuses on a single change.
• [x] I have thoroughly tested my changes with multiple different prompts.
• [x] I have considered potential risks and mitigations for my changes.
• [x] I have documented my changes clearly and comprehensively.
• [x] I have not snuck in any "extra" small tweaks changes

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: -7.80 :warning:

Comparison is base (7a006af) 51.00% compared to head (3797eb6) 43.21%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3291      +/-   ##
==========================================
- Coverage   51.00%   43.21%   -7.80%     
==========================================
  Files          65       65              
  Lines        2976     2976              
  Branches      504      504              
==========================================
- Hits         1518     1286     -232     
- Misses       1334     1615     +281     
+ Partials      124       75      -49     

Impacted Files	Coverage Δ
autogpt/api_manager.py	93.18% <ø> (-2.28%)	:arrow_down:

... and 16 files with indirect coverage changes

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.

[hdkiller]

I think this should be 3 different PRs.

[github-actions[bot]]

This pull request has conflicts with the base branch, please resolve those so we can evaluate the pull request.

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 26, 2023 11:45pm

[github-actions[bot]]

Conflicts have been resolved! 🎉 A maintainer will review the pull request shortly.