docs: correct spelling of "separate" in comments (#35484)

### **Issue # (if applicable)**
Closes #35483.


### **Reason for this change**
Fixed spelling errors in code comments where "seperate" was used instead of the correct spelling "separate".


### **Description of changes**
Corrected two instances of misspelled "separate" in documentation comments:

- Fixed "seperated" → "separated" in `core/lib/arn.ts:46`
- Fixed "seperate" → "separate" in `aws-globalaccelerator/lib/listener.ts:50`

These are simple spelling corrections that improve documentation quality without any functional changes.


### **Describe any new or updated permissions being added**
None. This change only affects documentation comments.


### **Description of how you validated changes**
- Verified spelling corrections are accurate
- Confirmed no functional code changes
- Build passes successfully


### **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)

Author: puretension

packages/aws-cdk-lib/aws-globalaccelerator/lib/listener.ts

@@ -47,7 +47,7 @@ export interface ListenerOptions {
    * If you have stateful applications, client affinity lets you direct all
    * requests from a user to the same endpoint.
    *
-   * By default, each connection from each client is routed to seperate
+   * By default, each connection from each client is routed to separate
    * endpoints. Set client affinity to SOURCE_IP to route all connections from
    * a single client to the same endpoint.
    *

packages/aws-cdk-lib/core/lib/arn.ts

@@ -43,7 +43,7 @@ export enum ArnFormat {
 
   /**
    * This represents a format where the 'resource' and 'resourceName'
-   * parts are seperated with a slash,
+   * parts are separated with a slash,
    * but there is also an additional slash after the colon separating 'account' from 'resource'.
    * Like in: 'arn:aws:service:region:account:/resource/resourceName'.
    * Note that the leading slash is _not_ included in the parsed 'resource' part.