Update butters_gp30_gp31.md

Remove duplicates of title

requested review from @ftesson

assigned to @ftesson

added 83 commits

• 1ce19010...9fd810f9 - 81 commits from branch main
• 6257dd8b - Merge branch 'main' into ftesson_butters_gp30_gp31
• b932f7b8 - merge main correct misspelling

Compare with previous version

merged

mentioned in commit f9ec9807