Improve changesets for tree errors (#21940)

## Description Improve/add error related changesets for tree.
microsoft · Jul 18, 2024 · 3b8a366 · 3b8a366
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diff --git a/.changeset/stale-rooms-bow.md b/.changeset/stale-rooms-bow.md
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+"fluid-framework": minor
 "@fluidframework/tree": minor
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diff --git a/.changeset/weak-swans-take.md b/.changeset/weak-swans-take.md
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+---
+"fluid-framework": minor
+"@fluidframework/tree": minor
+---
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+Improved error reporting
+
+Several cases of invalid usage patterns for tree APIs have gained improved error reporting, as well as improved documentation on the APIs detailing what usage is supported.
+These improvements include:
+
+-   Unsupported usages of schema classes: using more than one schema class derived from a single SchemaFactory generated base class. This used to hit internal asserts, but now has a descriptive user-facing UsageError. Most of this work was done in [9fb3dcf](https://github.com/microsoft/FluidFramework/commit/9fb3dcf491a7f0d66f4abbdc64ab97ccabef4707).
+
+-   Improved detection of when prior exception may have left SharedTree in an invalid state.
+These cases now report a UsageError including a reference to the prior exception. This was mainly done in [9fb3dcf](https://github.com/microsoft/FluidFramework/commit/9fb3dcf491a7f0d66f4abbdc64ab97ccabef4707) and [b77d530](https://github.com/microsoft/FluidFramework/commit/b77d530b9252201c40a90d1a2a6315f76f1a4a4b).