Added doctests for map, collectFirst, foldLeft, and foldRight for NonEmptyList #3286

Job	Run time
Validate Steward Config (ubuntu-22.04, temurin@11)	16s
Scalafix (ubuntu-22.04, temurin@8)	55s
Generate Site (ubuntu-22.04, temurin@17)	3m 8s
Test (ubuntu-22.04, 2.12, temurin@8, catsJS)	3m 13s
Test (ubuntu-22.04, 2.13, temurin@8, catsNative)	3m 13s
Test (ubuntu-22.04, 2.12, temurin@8, catsNative)	3m 13s
Test (ubuntu-22.04, 2.12, temurin@8, catsJVM)	3m 13s
Test (ubuntu-22.04, 2.13, graalvm@21, catsJVM)	3m 13s
Test (ubuntu-22.04, 2.13, temurin@8, catsJVM)	3m 12s
Test (ubuntu-22.04, 2.13, temurin@8, catsJS)	3m 13s
Test (ubuntu-22.04, 3, temurin@8, catsJS)	3m 14s
Test (ubuntu-22.04, 3, temurin@8, catsNative)	3m 16s
Test (ubuntu-22.04, 3, temurin@8, catsJVM)	3m 13s
Test (ubuntu-22.04, 2.13, temurin@17, catsJVM)	3m 14s
Submit Dependencies	-1s
Publish Artifacts	1s
	39m 46s

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