Update abij.md

Add AbiJ description, molecular mechanism and ref #196 (closed)

added DefenseSystem label

requested review from @jcury

assigned to @ftesson

added 2 commits

• b7d53c08 - merge main correct misspelling
• 42095fe4 - merge main correct misspelling

Compare with previous version

@jcury Problem with a lot of files also. I will redo it.

closed