[Repo Assist] docs: add missing (returns) XML tags to singleton, isEmpty, length, lengthOrMax, lengthBy, lengthByAsync

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Summary

Six members in TaskSeq.fsi were missing (returns) XML documentation tags, making IntelliSense tooltips and generated API docs incomplete for these functions.

Function	Return type	Added (returns) text
singleton	TaskSeq<'T>	"A task sequence containing exactly one element."
isEmpty	Task(bool)	"A task returning true if the sequence contains no elements; false otherwise."
length	Task(int)	"A task returning the number of elements in the sequence."
lengthOrMax	Task(int)	"A task returning the actual length of the sequence, or max if the sequence is longer than max."
lengthBy	Task(int)	"A task returning the number of elements for which predicate returns true."
lengthByAsync	Task(int)	Same as lengthBy.

All other members already had (returns) tags; these were simply overlooked.

Changes

File	Change
TaskSeq.fsi	Added 6 (returns) tags
release-notes.txt	Updated under 1.0.0

Trade-offs

Documentation-only change; no runtime behaviour is affected.

Test Status

✅ Build: dotnet build src/FSharp.Control.TaskSeq.sln -c Release — succeeded, 0 warnings, 0 errors
✅ Format: dotnet fantomas src/FSharp.Control.TaskSeq/TaskSeq.fsi — unchanged (already formatted)
No tests need updating for a documentation-only change.

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