Typo fixes

[LefterisJP]

Just cherry picking the typo fixes from #5107 as the test does not make sense to be merged since can't reproduce the exact issue that lead to #5051

[codecov]

Codecov Report

Merging #5113 into develop will increase coverage by 0.23%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #5113      +/-   ##
===========================================
+ Coverage    80.42%   80.65%   +0.23%     
===========================================
  Files          120      120              
  Lines        14717    14717              
  Branches      2288     2288              
===========================================
+ Hits         11836    11870      +34     
+ Misses        2210     2171      -39     
- Partials       671      676       +5

Impacted Files	Coverage Δ
raiden/network/rpc/client.py	74.67% <ø> (-0.66%)	⬇️
raiden/network/transport/matrix/transport.py	79.39% <0%> (-0.46%)	⬇️
raiden/raiden_event_handler.py	93.1% <0%> (+0.62%)	⬆️
raiden/api/python.py	68.13% <0%> (+0.98%)	⬆️
raiden/utils/echo_node.py	69.49% <0%> (+1.69%)	⬆️
raiden/network/proxies/token_network.py	50.91% <0%> (+1.94%)	⬆️
raiden/tasks.py	70.8% <0%> (+3.64%)	⬆️
raiden/storage/serialization/types.py	72.36% <0%> (+3.94%)	⬆️
raiden/waiting.py	85.71% <0%> (+4%)	⬆️

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[palango]

Nice finds!