Fix paramrefs (System.Collections, System.Buffers, etc.)

[gewarren]

Contributes to #10183.

(Hide whitespace changes.)

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-collections

[learn-build-service-prod]

Learn Build status updates of commit 156f0cf:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/Microsoft.Extensions.DependencyInjection/ISupportRequiredService.xml	✅Succeeded	View
xml/System.Buffers.Text/Base64Url.xml	✅Succeeded	View
xml/System.Buffers/BuffersExtensions.xml	✅Succeeded	View
xml/System.Collections.Concurrent/BlockingCollection`1.xml	✅Succeeded	View
xml/System.Collections.Concurrent/ConcurrentDictionary`2.xml	✅Succeeded	View
xml/System.Collections.Generic/Comparer`1.xml	✅Succeeded	View
xml/System.Collections.Generic/Dictionary`2.xml	✅Succeeded	View
xml/System.Collections.Generic/HashSet`1.xml	✅Succeeded	View
xml/System.Collections.Generic/List`1.xml	✅Succeeded	View
xml/System.Collections.Generic/OrderedDictionary`2+KeyCollection.xml	✅Succeeded	View
xml/System.Collections.Generic/SortedDictionary`2.xml	✅Succeeded	View
xml/System.Collections.Generic/SortedList`2.xml	✅Succeeded	View
xml/System.Collections.Generic/SynchronizedKeyedCollection`2.xml	✅Succeeded	View
xml/System.Collections.Immutable/IImmutableList`1.xml	✅Succeeded	View
xml/System.Collections.Immutable/ImmutableArray`1.xml	✅Succeeded	View
xml/System.Collections.Immutable/ImmutableInterlocked.xml	✅Succeeded	View
xml/System.Collections.Immutable/ImmutableList`1+Builder.xml	✅Succeeded	View
xml/System.Collections.ObjectModel/Collection`1.xml	✅Succeeded	View
xml/System.Collections.ObjectModel/KeyedCollection`2.xml	✅Succeeded	View
xml/System.Collections.ObjectModel/ReadOnlyCollection`1.xml	✅Succeeded	View
xml/System.Collections.Specialized/HybridDictionary.xml	✅Succeeded	View
xml/System.Collections.Specialized/NotifyCollectionChangedEventArgs.xml	✅Succeeded	View
xml/System.Collections/IEqualityComparer.xml	✅Succeeded	View
xml/System.Runtime.Intrinsics.Arm/Sve.xml	✅Succeeded	View
xml/System/Char.xml	✅Succeeded	View

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[BillWagner]

This LGTM @gewarren

Let's