docs(changeset): Remove a period from a changeset (microsoft#23174)

#### Description

A header of the changeset created for `Tree` package change includes
`.`. Removing it for conformity with other changesets.

.changeset/dull-words-work.md

@@ -6,6 +6,6 @@
 "section": tree
 ---
 
-Enables Revertible objects to be cloned using `RevertibleAlpha.clone()`.
+Enables Revertible objects to be cloned using `RevertibleAlpha.clone()`
 
 Replaced `DisposableRevertible` with `RevertibleAlpha`. The new `RevertibleAlpha` interface extends `Revertible` and includes a `clone(branch: TreeBranch)` method to facilitate cloning a Revertible to a specified target branch. The source branch where the `RevertibleAlpha` was created must share revision logs with the target branch where the `RevertibleAlpha` is being cloned. If this condition is not met, the operation will throw an error.