Document behavior of trailing empty lines for `ExcessiveDocstringSpacing` #2384

Job	Run time
Confirm config and documentation	8s
Test coverage	18s
Edge RuboCop: internal_investigation	19s
Oldest RuboCop: spec	19s
Edge RuboCop: spec	25s
Ruby 2.7: internal_investigation	26s
Prism	30s
Ruby 2.7: spec	33s
RSpec 4	25s
Ruby 3.0: internal_investigation	12s
Ruby 3.0: spec	22s
Ruby 3.1: internal_investigation	15s
Ruby 3.1: spec	23s
Ruby 3.2: internal_investigation	15s
Ruby 3.2: spec	22s
Ruby 3.3: internal_investigation	12s
Ruby 3.3: spec	18s
Ruby ruby-head: internal_investigation	21s
Ruby ruby-head: spec	17s
Ruby jruby-9.4: internal_investigation	1m 24s
Ruby jruby-9.4: spec	1m 32s
	9m 16s

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