Fix typos

[Thabokani]

Fix some typos in comments. Thank you.

[t-bast]

Thanks!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9c4aad0) 85.82% compared to head (a778194) 85.86%.
Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2805      +/-   ##
==========================================
+ Coverage   85.82%   85.86%   +0.03%     
==========================================
  Files         216      216              
  Lines       18177    18177              
  Branches      790      790              
==========================================
+ Hits        15601    15607       +6     
+ Misses       2576     2570       -6     

Files	Coverage Δ
...cala/fr/acinq/eclair/crypto/TransportHandler.scala	90.76% <ø> (ø)
...r/acinq/eclair/payment/send/PaymentLifecycle.scala	86.84% <ø> (ø)

... and 5 files with indirect coverage changes