Update abi2.md

Missing: Structure Experimental validation

issue #289 (closed)

@ftesson so should we merge this page with AbiD ? @mdomingu now that you're Abi2 specialist, what do you think ?

added DefenseSystem pending review labels

added 78 commits

• 237f6c11...bd37520d - 77 commits from branch main
• 2dd2f158 - Merge branch 'main' into 'mdomingu-main-patch-69264'

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added 211 commits

• 2dd2f158...99a0d69f - 209 commits from branch main
• 587dcba2 - Merge branch 'main' into mdomingu-main-patch-69264
• 1c97d298 - merge main add information

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resolved all threads

added 1 commit

• 1ecf72e8 - add exp validation + structure form AbiD

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merged

mentioned in commit 513222a7