docs: clarify open source stance

[nedbat]

Changes based on guidance at
https://2u-internal.atlassian.net/wiki/spaces/ENG/pages/493453499/Repo+deltas+for+edx+GitHub+repos

[codecov-commenter]

Codecov Report

Attention: 171 lines in your changes are missing coverage. Please review.

Comparison is base (445b365) 91.59% compared to head (46302ed) 69.01%.
Report is 74 commits behind head on main.

Files	Patch %	Lines
...r-steps/view-results/RelatedSkillsSingleBoxSet.jsx	4.25%	45 Missing ⚠️
...lect-preferences/CareerInterestCategorizinator.jsx	2.77%	34 Missing and 1 partial ⚠️
...ps/view-results/RelatedSkillsInteractiveBoxSet.jsx	0.00%	23 Missing ⚠️
.../skills-builder-steps/SkillsBuilderProgressive.jsx	6.66%	14 Missing ⚠️
src/skills-builder/ProductTool.jsx	9.09%	10 Missing ⚠️
...lls-builder/visibility-flags-context/data/hooks.js	9.09%	8 Missing and 2 partials ⚠️
...s-builder/visibility-flags-context/data/reducer.js	0.00%	7 Missing and 1 partial ⚠️
...builder-steps/view-results/RecommendationStack.jsx	72.22%	5 Missing ⚠️
.../skills-builder-steps/view-results/ViewResults.jsx	85.29%	5 Missing ⚠️
.../skills-builder-steps/view-results/data/service.js	55.55%	2 Missing and 2 partials ⚠️
... and 5 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #100       +/-   ##
===========================================
- Coverage   91.59%   69.01%   -22.59%     
===========================================
  Files          30       43       +13     
  Lines         369      639      +270     
  Branches       68      152       +84     
===========================================
+ Hits          338      441      +103     
- Misses         30      188      +158     
- Partials        1       10        +9     

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[deborahgu]