update doc

Author: BatyLeo

docs/src/api/argmax.md

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+# Argmax
+
+## Public
+
+```@autodocs
+Modules = [DecisionFocusedLearningBenchmarks.Argmax]
+Private = false
+```
+
+## Private
+
+```@autodocs
+Modules = [DecisionFocusedLearningBenchmarks.Argmax]
+Public = false
+```

docs/src/api/ranking.md

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+# Ranking
+
+## Public
+
+```@autodocs
+Modules = [DecisionFocusedLearningBenchmarks.Ranking]
+Private = false
+```
+
+## Private
+
+```@autodocs
+Modules = [DecisionFocusedLearningBenchmarks.Ranking]
+Public = false
+```