Doc updates for collections

[danmoseley]

From running porting tool.

Fixes dotnet/runtime#54869

[ghost]

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Issue Details

---

From running porting tool.

Fixes dotnet/runtime#54869

Author:	danmoseley
Assignees:	-
Labels:	area-System.Collections
Milestone:	-

[opbld34]

Docs Build status updates of commit 07540cf:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Collections.Concurrent/ConcurrentDictionary`2.xml	✅Succeeded	View
xml/System.Collections.Generic/List`1.xml	✅Succeeded	View
xml/System.Collections.Generic/PriorityQueue`2+UnorderedItemsCollection+Enumerator.xml	✅Succeeded	View
xml/System.Collections.Generic/PriorityQueue`2+UnorderedItemsCollection.xml	✅Succeeded	View
xml/System.Collections.Generic/PriorityQueue`2.xml	✅Succeeded	View
xml/System.Collections.Generic/Queue`1.xml	✅Succeeded	View
xml/System.Collections.Generic/SortedList`2.xml	✅Succeeded	View
xml/System.Collections.Generic/Stack`1.xml	✅Succeeded	View

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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[eiriktsarpalis]

Thanks! Since there is a small number of <returns> elements that hasn't been documented I'm going to keep dotnet/runtime#54869 open for now. Rather than filling in the gaps in this PR I want to update the source documentation and re-run the porting tool once complete.

cc @carlossanlop