Fix `forge_experiment` refs in full 3.0.0 changelog entry

[HunterMcGushion]

• Erroneously used set_experiment_guidelines, which had been renamed to forge_experiment

[codecov[bot]]

Codecov Report

Merging #179 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #179   +/-   ##
=======================================
  Coverage   94.07%   94.07%           
=======================================
  Files          46       46           
  Lines        4961     4961           
=======================================
  Hits         4667     4667           
  Misses        294      294

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[coveralls]

Pull Request Test Coverage Report for Build 786

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 94.074%

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Totals
Change from base Build 784:	0.0%
Covered Lines:	4667
Relevant Lines:	4961

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💛 - Coveralls