AF-3912 Update Dart 2 codemod references

[evanweible-wf]

Description

The name/usage of the dart2 upgrade codemod script changed slightly, so the references in the over_react dart 2 migration guide need to be updated accordingly.

Testing suggestions:

n/a

Potential areas of regression:

n/a

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FYA: @greglittlefield-wf @aaronlademann-wf @kealjones-wk @evanweible-wf @maxwellpeterson-wf

[aviary2-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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Questions or Comments? Reach out on Slack: #support-infosec.

[codecov-io]

Codecov Report

Merging #226 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #226   +/-   ##
======================================
  Coverage    90.3%   90.3%           
======================================
  Files          35      35           
  Lines        1772    1772           
======================================
  Hits         1600    1600           
  Misses        172     172

[corwinsheahan-wf]

QA +1

• CI Passes (documentation change only)

Merging into master.
@Workiva/release-management-p