Tests

docs: add docstring for discretes support in `AbstractDiffEqArray` #135

Job	Run time
Tests (1, Core) / Tests - Core	5m 39s
Tests (1, Downstream) / Tests - Downstream	16m 24s
Tests (lts, Core) / Tests - Core	4m 28s
Tests (lts, Downstream) / Tests - Downstream	9m 18s
Tests (pre, Core) / Tests - Core	4m 47s
Tests (pre, Downstream) / Tests - Downstream	19m 48s
	1h 0m 24s

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