core,aws-globalaccelerator: Fix "seperate" spelling in comments

[puretension]

Describe the issue

Found spelling errors in code comments where "seperate" is used instead of the correct spelling "separate":

Location 1: packages/aws-cdk-lib/core/lib/arn.ts:46

• Current: "parts are seperated with a slash"
• Should be: "parts are separated with a slash"

Location 2: packages/aws-cdk-lib/aws-globalaccelerator/lib/listener.ts:50

• Current: "routed to seperate endpoints"
• Should be: "routed to separate endpoints"

Links

• https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/core/lib/arn.ts#L46
• https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-globalaccelerator/lib/listener.ts#L50

[github-actions]

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