config: add some warning comments about changing RewardUnit value

[algorandskiy]

No description provided.

[codecov-commenter]

Codecov Report

Merging #3846 (7dfca75) into master (d8ea805) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3846      +/-   ##
==========================================
- Coverage   49.99%   49.98%   -0.01%     
==========================================
  Files         393      393              
  Lines       68390    68390              
==========================================
- Hits        34190    34185       -5     
- Misses      30463    30470       +7     
+ Partials     3737     3735       -2     

Impacted Files	Coverage Δ
config/consensus.go	85.53% <ø> (ø)
data/bookkeeping/block.go	55.23% <ø> (ø)
ledger/blockqueue.go	82.18% <0.00%> (-2.88%)	⬇️
network/wsPeer.go	65.83% <0.00%> (-2.23%)	⬇️
agreement/cryptoVerifier.go	68.08% <0.00%> (-2.13%)	⬇️
agreement/proposalManager.go	96.07% <0.00%> (-1.97%)	⬇️
cmd/tealdbg/debugger.go	71.42% <0.00%> (-0.99%)	⬇️
network/wsNetwork.go	62.99% <0.00%> (+0.19%)	⬆️
catchup/service.go	69.62% <0.00%> (+0.24%)	⬆️
data/transactions/verify/txn.go	45.02% <0.00%> (+0.86%)	⬆️
... and 3 more

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