docs(codebuild): updated Linux build image return type in doc (#31718)

### Issue # (if applicable)

Closes #31717 

### Reason for this change

It should be in sync with the description as mentioned in here https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_codebuild.LinuxArmBuildImage.html



### 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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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: khushail

packages/aws-cdk-lib/aws-codebuild/lib/linux-arm-build-image.ts

@@ -42,7 +42,7 @@ export class LinuxArmBuildImage implements IBuildImage {
   public static readonly AMAZON_LINUX_2_STANDARD_3_0 = LinuxArmBuildImage.fromCodeBuildImageId('aws/codebuild/amazonlinux2-aarch64-standard:3.0');
 
   /**
-   * @returns a x86-64 Linux build image from a Docker Hub image.
+   * @returns a aarch-64 Linux build image from a Docker Hub image.
    */
   public static fromDockerRegistry(name: string, options: DockerImageOptions = {}): IBuildImage {
     return new LinuxArmBuildImage({