doc(grdmask): Fix missing dash in `-Nz` option reference#8913

Merged

seisman merged 2 commits intomasterfrom

copilot/fix-nz-to-negative-nz

Mar 2, 2026

Commits on Mar 1, 2026

Initial plan
Copilot
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Fix Nz to -Nz in grdmask documentation

Copilot
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seisman
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