fix: disambiguate duplicate Verso labels in Section 2.2 - #661
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The four order-and-addition lemmas all carry the docstring "(d) (Addition preserves order)", so Verso sees one label four times. Fold the direction of the inequality into the parenthetical, which is what distinguishes ge_add_right/ge_add_left from le_add_right/le_add_left (the Mathlib cross-reference already distinguishes left from right).
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Nat.add_ge_add_right,Nat.add_ge_add_left,Nat.add_le_add_rightandNat.add_le_add_leftall carry the same docstring,(d) (Addition preserves order), so the label appears four times. The Mathlib cross-reference in each already separates left from right, so folding the direction of the inequality into the parenthetical is enough to make all four distinct.lake build Analysis.Section_2_2→Build completed successfully (3265 jobs).Lines stay under 100 characters.