[release/8.0] Mention Frozen.* types in PACKAGE.md for System.Collections.Immutable #93561
+5
−1
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Backport of #93541 to release/8.0
/cc @eiriktsarpalis @xakep139
Customer Impact
The System.Collections.Immutable NuGet package includes the newly added frozen collections, however these aren't being referenced in the README file. This PR rectifies that omission.
Testing
N/A
Risk
N/A