Remove release-notes entry

Not a PR into main. Belongs on #19602 if at all.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: T-Gro

docs/release-notes/.FSharp.Compiler.Service/11.0.100.md

@@ -40,7 +40,3 @@
 * Added warning FS3884 when a function or delegate value is used as an interpolated string argument. ([PR #19289](https://github.com/dotnet/fsharp/pull/19289))
 * Add `#version;;` directive to F# Interactive to display version and environment information. ([Issue #13307](https://github.com/dotnet/fsharp/issues/13307), [PR #19332](https://github.com/dotnet/fsharp/pull/19332))
 
-### Changed
-
-* Internal refactor: store extension operators added via `open type` in a name-indexed `NameMultiMap<MethInfo>` (`eOpenedTypeOperators`) instead of a flat list; dedup a hand-rolled `Dictionary<string, MethInfo list>` in `CheckEntityDefn` into the same convention. No public API change; no user-visible behavior change. Rationale and invariants documented in `docs/name-resolution-operators.md`.
-