linkedlist: correct grammar in comments
No changes to the functionality, just changed "a item" to "an item" in comments.
Checklist
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commit message follows commit guidelines
Affected core subsystem(s)
linkedlist
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
No changes to the functionality, just changed "a item" to "an item" in comments.
linkedlist