include partial ms gate feature

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ### New features since last release
 
+* Added an optional `theta` parameter to the MS gate to enable partially entangling gates, providing more control over qubit entanglement. This feature allows for finer adjustments in quantum algorithms without affecting existing implementations. [#101](https://github.com/PennyLaneAI/PennyLane-IonQ/pull/101)
+
 ### Improvements 🛠
 
 ### Breaking changes 💔
@@ -10,12 +12,16 @@
 
 ### Documentation 📝
 
+* Updated the docstring for the MS operation to include the new `theta` parameter, explaining its use and effects on the gate operation.
+
 ### Bug fixes 🐛
 
 ### Contributors ✍️
 
 This release contains contributions from (in alphabetical order):
 
+Spencer Churchill
+
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 # Release 0.34.0