Update qiskit_experiments/curve_analysis/__init__.py

Co-authored-by: Yael Ben-Haim <[email protected]>

Author: nkanazawa1989

qiskit_experiments/curve_analysis/__init__.py

@@ -31,7 +31,7 @@
 optimization tasks in the same class. The analysis is implemented with following data model.
 
 - Group: This is top level component of the fitting. If an analysis defines
-  multiple groups, it performs multiple independent optimization
+  multiple groups, it performs multiple independent optimizations
   and generates results for every optimization group.
 
 - Series: This is a collection of curves to form a multi-objective optimization task.