AVM: Document what the field _is_ rather than pointer to table

[jannotti]

doc change only (table has been moved, so pointer to it was wrong) better to describe the field anyway

[nullun]

Wonderful, thank you!

[codecov]

Codecov Report

Merging #4260 (8ebf4d6) into master (1335f16) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4260   +/-   ##
=======================================
  Coverage   55.13%   55.13%           
=======================================
  Files         395      395           
  Lines       50117    50117           
=======================================
+ Hits        27630    27634    +4     
+ Misses      20111    20103    -8     
- Partials     2376     2380    +4     

Impacted Files	Coverage Δ
data/transactions/logic/fields.go	77.10% <ø> (ø)
cmd/algoh/blockWatcher.go	77.77% <0.00%> (-3.18%)	⬇️
ledger/tracker.go	76.95% <0.00%> (-2.18%)	⬇️
ledger/acctonline.go	77.83% <0.00%> (-1.11%)	⬇️
data/abi/abi_type.go	87.67% <0.00%> (-0.95%)	⬇️
ledger/acctupdates.go	70.34% <0.00%> (-0.61%)	⬇️
network/wsPeer.go	67.67% <0.00%> (-0.55%)	⬇️
catchup/service.go	69.38% <0.00%> (-0.25%)	⬇️
catchup/peerSelector.go	100.00% <0.00%> (+1.04%)	⬆️
node/node.go	24.31% <0.00%> (+1.93%)	⬆️
... and 3 more

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