docs: Codespell check on English sources + swd fixes (#26657)

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Hamish Willee
2026-03-05 12:50:59 +11:00
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@@ -67,7 +67,7 @@ The consensus [appears to be](https://discuss.px4.io/t/vio-vs-optical-flow/34680
Optical flow:
- Downward facing optical flow gives you a planar velocity thats corrected for angular velocity with the gyro.
- Downward facing optical flow gives you a planar velocity that's corrected for angular velocity with the gyro.
- Requires an accurate distance to the ground and assumes a planar surface.
Given those conditions it can be just as accurate/reliable as VIO (such as indoor flight)
- Is more robust than VIO as it has fewer states.