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

docs/en/flight_modes_mc/follow_me.md

@@ -31,7 +31,7 @@ By default it will follow from directly behind the target at a distance of 8 met
 Users can adjust the follow angle, height and distance using an RC controller as shown above:
 
 - _Follow Height_ is controlled with the `up-down` input ("Throttle").
-  Center the stick to keep follow the target at a constant hight. Raise or lower the stick to adjust height.
+  Center the stick to keep follow the target at a constant height. Raise or lower the stick to adjust height.
 - _Follow Distance_ is controlled with the `forward-back` input ("Pitch").
   Pushing the stick forward increases the follow distance, pulling it back decreases the distance.
 - _Follow Angle_ is controlled with the `left-right` input ("Roll").
@@ -117,7 +117,7 @@ The altitude control mode determine whether the vehicle altitude is relative to
 - `2D + Terrain` makes the drone follow at a fixed height relative to the terrain underneath it, using information from a distance sensor.
   - If the vehicle does not have a distance sensor following will be identical to `2D tracking`.
   - Distance sensors aren't always accurate and vehicles may be "jumpy" when flying in this mode.
-  - Note that that height is relative to the ground underneath the vehicle, not the follow target.
+  - Note that height is relative to the ground underneath the vehicle, not the follow target.
     The drone may not follow altitude changes of the target!
 
 - `3D tracking` mode makes the drone follow at a height relative to the follow target, as supplied by its GPS sensor.

docs/en/flight_modes_mc/mission.md

@@ -59,7 +59,7 @@ Missions can be paused by switching out of mission mode to any other mode (such
 If the vehicle was not capturing images when it was paused, on resuming it will head from its _current position_ towards the same waypoint as it as was heading towards originally.
 If the vehicle was capturing images (has camera trigger items) it will instead head from its current position towards the last waypoint it traveled through (before pausing), and then retrace its path at the same speed and with the same camera triggering behaviour.
 This ensures that in survey/camera missions the planned path is captured.
-A mission can be uploaded while the vehicle is paused, in which which case the current active mission item is set to 1.
+A mission can be uploaded while the vehicle is paused, in which case the current active mission item is set to 1.
 
 ::: info
 When a mission is paused while the camera on the vehicle was triggering, PX4 sets the current active mission item to the previous waypoint, so that when the mission is restarted the vehicle will retrace its last mission leg.

docs/en/flight_modes_mc/return.md

@@ -48,7 +48,7 @@ This is useful when there are few obstacles near the destination, because it may
 
 ![Return mode cone](../../assets/flying/rtl_cone.jpg)
 
-The cone affects the minimum return altitude if return mode is triggered within the cylinder defined by the maximum cone radius and `RTL_RETURN_ALT`: outside this cyclinder `RTL_RETURN_ALT` is used.
+The cone affects the minimum return altitude if return mode is triggered within the cylinder defined by the maximum cone radius and `RTL_RETURN_ALT`: outside this cylinder `RTL_RETURN_ALT` is used.
 Inside the code the minimum return altitude is the intersection of the vehicle position with the cone, or `RTL_DESCEND_ALT` (whichever is higher).
 In other words, the vehicle must always ascend to at least `RTL_DESCEND_ALT` if below that value.