Update references to DataLogging default output path

[JosephusPaye]

This PR updates references to log/ as the DataLogging output directory to recordings/, to match https://github.com/NUbots/NUbots/pull/1282.

Changed pages:

• https://deploy-preview-301--nubook.netlify.app/system/tools/natnet_sdk
• https://deploy-preview-301--nubook.netlify.app/guides/main/data-recording-playback
• https://deploy-preview-301--nubook.netlify.app/guides/main/camera-calibration

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