Fix docs for --managed-record-types

[Sewci0]

When passed as a comma separated list managed-record-types ends up being an array with a single element.
Instead it should be passed multiple times to include more than one record, same as in:

external-dns/pkg/apis/externaldns/types_test.go

Line 374 in cfdc4b4

"--managed-record-types=A",

[linux-foundation-easycla]

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[odinuge]

/ok-to-test

[szuecs]

/approve
/lgtm

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