Update (fixed spelling mistakes in the page) GPS_fix_estimation.md

[Fire18Parrot]

I have fixed some spelling mistakes

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[sensei-hacker]

Thanks!

[Fire18Parrot]

No worries!
I'll probably correct a few more pages in the future...
I had however heard that there was a rework in progress in the inav docs, if its happening is there some ETA? Apparently its supposed to become like the betaflight and rotorflight docs?