ledger: fix typo in error.go

[eltociear]

Summary

relavant -> relevant

Test Plan

[codecov]

Codecov Report

Merging #4143 (5dfe197) into master (967a3ec) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4143      +/-   ##
==========================================
+ Coverage   54.54%   54.56%   +0.02%     
==========================================
  Files         391      391              
  Lines       48732    48732              
==========================================
+ Hits        26580    26592      +12     
+ Misses      19930    19920      -10     
+ Partials     2222     2220       -2     

Impacted Files	Coverage Δ
ledger/ledgercore/error.go	0.00% <ø> (ø)
data/abi/abi_type.go	87.67% <0.00%> (-0.95%)	⬇️
data/transactions/verify/txn.go	44.15% <0.00%> (-0.87%)	⬇️
catchup/service.go	68.14% <0.00%> (-0.75%)	⬇️
network/wsNetwork.go	65.17% <0.00%> (+0.28%)	⬆️
ledger/acctupdates.go	69.43% <0.00%> (+0.65%)	⬆️
network/wsPeer.go	68.49% <0.00%> (+0.82%)	⬆️
ledger/tracker.go	75.32% <0.00%> (+2.16%)	⬆️
ledger/roundlru.go	96.22% <0.00%> (+5.66%)	⬆️

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