tealdbg group-id documentation

[barnjamin]

Document that the program source must be specified if a group id is passed.

This check throws an error with the current docs
https://github.com/algorand/go-algorand/blob/master/cmd/tealdbg/main.go#L206-L208

[codecov-commenter]

Codecov Report

Merging #3083 (0d7648d) into master (b9c6032) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3083      +/-   ##
==========================================
- Coverage   43.66%   43.66%   -0.01%     
==========================================
  Files         391      391              
  Lines       86855    86855              
==========================================
- Hits        37927    37925       -2     
- Misses      42895    42898       +3     
+ Partials     6033     6032       -1     

Impacted Files	Coverage Δ
ledger/blockqueue.go	81.03% <0.00%> (-1.15%)	⬇️
catchup/service.go	69.35% <0.00%> (-0.78%)	⬇️
ledger/acctupdates.go	64.65% <0.00%> (-0.10%)	⬇️
catchup/peerSelector.go	100.00% <0.00%> (+1.04%)	⬆️
cmd/algoh/blockWatcher.go	80.95% <0.00%> (+3.17%)	⬆️

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[barnjamin]

not necessary after #3111