Rename inline nav class

[joolswood]

Description

Changes inline-nav to inline-tab-nav and renames hbs file for consistency with the documentation.

Definition of Done

• [X] Content/documentation reviewed by Julian or someone in the Content Team
• [x] UX reviewed by Gary or someone the Design team
• [x] Stakeholder/PO review
• [x] CHANGELOG updated

[gazhands]

LGTM