Fix #34414: remove legacy doc content [skip ci] #34416
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Remove the paragraphs saying "Immutable composite types with no fields are singletons".
Previously,
MutableNoFields() === MutableNoFields()
, but this was changed in #25854. When that got changed, the existing docs was tweaked to say that the struct had to be immutable(#25862) . However, there is no longer anything specific about it having no fields. The docs about singletons can thus just be removed since they are not special anymore.