Update buffer-and-pause-timeline.md

src/pages/guides/use-cases/media-edge/buffer-and-pause-timeline.md

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-# Use case: Media Edge API a Buffer State and a Pause
+# Media Edge API Use case: A Buffer State and a Pause
 
 This guide provides a use case example of a media session tracked with the Media Edge API service. The example session shown for this use case contains the following elements: