Fix typos across documentation files

[him2him2]

Summary

• Fix 20 typos across 9 documentation files (READMEs and test notes)
• Notable fixes: rs1279 → rs1729 (correct developer username), dfm_detect → dft_detect (correct utility name), Bit-Error-Eate → Bit-Error-Rate
• Various spelling corrections: acheive, comparions, thredshold, performanance, meainingful, compex, noticable, Asuming, differnet, Optimzation, Worse-Case

Test plan

• Verified all changes are documentation-only (no code changes)
• Confirmed no formatting or content meaning was altered

[xssfox]

Was a tool used for this change?

[darksidelemm]

I'm not against typo fixes in documentation, but a lot of these are ancient notes files which are mostly irrelevant nowadays. The changes to the main README.md are probably the only ones that are important

[him2him2]

@xssfox Yes, I used Claude Code to help identify the typos.

[him2him2]

@darksidelemm That makes sense — happy to scope this down to just the README.md changes if you'd prefer. Want me to update the PR?

[xssfox]

@him2him2 won't impact the PR at all, but I'd love to know why? Do you use radiosonde_auto_rx and wanted to clean up hard to read documentation? did you just want to contribute to the project?

[him2him2]

@xssfox Hi! My 8-year-old and I run this software to track and recover weather balloons. We've had a great time with it when the wind was blowing our way. Just looking for a way to give back — and this was something I could do.

Thanks for all you do to keep this software working!