nazca #116943 Write an example of `alignall_iterative` usage. [validation pending]

Write an example of alignall_iterative into the doc.

prioritynormal
typeenhancement
done in0.2.0
load0.100
load left0.000
closed by#e5f1e678e654 [doc] Little explanation on alignall_iterative() (closes #116943)
patch[doc] Little explanation on alignall_iterative() (closes #116943) [applied]