In the section Developing with Combine, the subsection Reasoning about pipelines contains an extra word (are) in the first sentence as highlighted in the copied text:
Reasoning about pipelines
When developing with Combine, there are two broader patterns of publishers are that frequently recur: expecting a publisher to return a single value and complete and expecting a publisher to return many values over time.
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In the section Developing with Combine, the subsection Reasoning about pipelines contains an extra word (are) in the first sentence as highlighted in the copied text:
Reasoning about pipelines
When developing with Combine, there are two broader patterns of publishers are that frequently recur: expecting a publisher to return a single value and complete and expecting a publisher to return many values over time.