internal/godoc/dochtml: enhance output parsing for example func

[wdhongtw]

Current logic for detecting "concluding line comment" is not strict
enough that it may cause false-positive, causing some normal comment
(and code following it) to be discarded in the rendered web page.

Ensure that "concluding line comment" can only be prefixed by spaces.
Also add corresponding test case.

Fixes golang/go#65450

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