Unit test target_processors does not accept an array, contrary to documentation

According to current documentation:

A JSON Pointer that identifies the specific processors which should be executed by the test. The target can either be a single processor or an array of processors. Alternatively a resource label can be used to identify a processor.
It is also possible to target processors in a separate file by prefixing the target with a path relative to the test file followed by a # symbol.
Type: string
Default: "/pipeline/processors"

However, in practice, trying to specify an array (or anything other than a string) results in an unmarshalling error:

$ benthos test kafka2kinesis.yaml 
Failed to obtain test targets: failed to parse test definition from '<redacted>l': yaml: unmarshal errors:
  line 53: cannot unmarshal !!seq into string

Line 53 of :
target_processors: ['microbatch_split', 'microbatch_aggregate']

The plurality of 'processors' leads me to believe allowing multiple processors was intended, and that this is indeed a bug (rather than a documentation issue).

Benthos version:

$ benthos --version
Version: 4.6.0
Date: 2022-08-31T18:38:28Z

Of note, this bug exists as far back as 4.3.0, and possibly earlier.

Reproduce the failure with benthos test kafka2kinesis.yaml and the target_processors array shown in the issue. Start by tracing test-definition parsing and the target_processors field, then inspect existing tests for processor targeting. Done means arrays of processor targets parse and execute as the documentation describes, with regression coverage.