airframes markdownout.py - br rather than p for generated code

[hamishwillee]

This makes very minor change to the generated output for the airframe markdown, replacing a section surrounded by <p> tags with a single preceding <br>.
Both are valid, but for some reason when the former round-trips through crowdin, we end up with an extra opening p element, which causes vitepress to crash.

The output from this works (tested).

[github-actions]

FLASH Analysis

px4_fmu-v5x

    FILE SIZE        VM SIZE    
--------------  -------------- 
+0.0%      +8  +0.0%      +8    .text
-0.0%      -8  [ = ]       0    [Unmapped]
[ = ]       0  +0.0%      +8    TOTAL

px4_fmu-v6x

    FILE SIZE        VM SIZE    
--------------  -------------- 
+0.0%      +8  +0.0%      +8    .text
-0.0%      -8  [ = ]       0    [Unmapped]
[ = ]       0  +0.0%      +8    TOTAL

Updated: 2024-11-28T10:47:38