climb_or_descend_segment_gradient renamed to climb_or_descent_segment_gradient

Description

Please see aircraft-references!11 (merged)

Once this merge is accepted, accept the one above.

changed milestone to %Milestone Armstrong

added moduleinitial_sizing typebug labels

requested review from @Florian.Schueltke and @johannes.schneider

assigned to @gPauls-TUHH

enabled an automatic merge when all merge checks for 98391ee0 pass

mentioned in merge request aircraft-references!11 (merged)

approved this merge request

merged

mentioned in commit 5820e6a3