Fix error in UNWIND docs.
Merge pull request #3516 from nawroth/2.0-unwind

Fix error in UNWIND docs.
Merge remote-tracking branch 'upstream/2.0-maint' into 2.1-maint
Merge branch '2.1-maint'

Conflicts:
	community/cypher/docs/cypher-docs/src/test/scala/org/neo4j/cypher/docgen/UnwindTest.scala