ABI: Fix typo in abi_type.go

[eltociear]

Summary

lenth -> length

Test Plan

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #3940 (e18d142) into master (1729a3e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3940   +/-   ##
=======================================
  Coverage   49.79%   49.79%           
=======================================
  Files         409      409           
  Lines       68892    68892           
=======================================
  Hits        34303    34303           
+ Misses      30884    30882    -2     
- Partials     3705     3707    +2     

Impacted Files	Coverage Δ
data/abi/abi_type.go	87.67% <ø> (-0.95%)	⬇️
util/metrics/reporter.go	56.31% <0.00%> (-4.86%)	⬇️
ledger/blockqueue.go	82.18% <0.00%> (-2.88%)	⬇️
network/wsPeer.go	68.05% <0.00%> (-0.56%)	⬇️
network/wsNetwork.go	62.99% <0.00%> (-0.20%)	⬇️
cmd/tealdbg/debugger.go	73.49% <0.00%> (+0.80%)	⬆️
catchup/peerSelector.go	100.00% <0.00%> (+1.04%)	⬆️
catchup/service.go	70.12% <0.00%> (+1.23%)	⬆️
crypto/merkletrie/node.go	93.48% <0.00%> (+1.86%)	⬆️
... and 1 more

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