docs: Numerous spelling and grammer fixes in flight controller section (#26582)

docs/en/flight_controller/modalai_fc_v1.md

@@ -2,11 +2,11 @@
 
 <Badge type="info" text="Discontinued" /> <Badge type="tip" text="PX4 v1.11" />
 
-:::warning
+::: warning
 This frame has been [discontinued](../flight_controller/autopilot_experimental.md) and is no longer commercially available.
 :::
 
-:::warning
+::: warning
 PX4 does not manufacture this (or any) autopilot.
 Contact the [manufacturer](https://forum.modalai.com/) for hardware support or compliance issues.
 :::
@@ -77,7 +77,7 @@ More information about the firmware can be found [here](https://docs.modalai.com
 
 ## QGroundControl Support
 
-This board supported in QGroundControl 4.0 and later.
+This board is supported in QGroundControl 4.0 and later.
 
 ## Availability
 
@@ -122,7 +122,7 @@ The full user guide is available [here](https://docs.modalai.com/flight-core-man
 
 To [build PX4](../dev_setup/building_px4.md) for this target:
 
-```
+```sh
 make modalai_fc-v1
 ```