docs(mixins-preview): fix omission of updating name for OVERRIDE strategy (#36204)

### Issue # (if applicable)

N/A

### Reason for this change



nit.

### Description of changes



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### Description of how you validated changes



### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

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Author: go-to-k

packages/@aws-cdk/mixins-preview/README.md

@@ -178,7 +178,7 @@ Mixins.of(bucket).apply(new CfnBucketPropsMixin(
   { strategy: PropertyMergeStrategy.MERGE }
 ));
 
-// OVERWRITE: Replaces existing property values
+// OVERRIDE: Replaces existing property values
 Mixins.of(bucket).apply(new CfnBucketPropsMixin(
   { versioningConfiguration: { status: "Enabled" } },
   { strategy: PropertyMergeStrategy.OVERRIDE }