fix a comment error in IsSubDomain

[victory460]

Why is this pull request needed and what does it do?

Fix a comment error in IsSubDomain.

[codecov-commenter]

Codecov Report

Merging #1509 (f56c2ed) into master (80e8a58) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1509      +/-   ##
==========================================
+ Coverage   71.21%   71.24%   +0.02%     
==========================================
  Files         415      415              
  Lines       40413    40413              
==========================================
+ Hits        28780    28791      +11     
+ Misses       9811     9801      -10     
+ Partials     1822     1821       -1     

Flag	Coverage Δ
go-1.14	71.19% <100.00%> (-0.02%)	⬇️
go-1.15	71.19% <100.00%> (-0.01%)	⬇️
go-1.16	71.19% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
text/gstr/gstr_domain.go	100.00% <100.00%> (ø)
os/gspath/gspath_cache.go	91.22% <0.00%> (-3.51%)	⬇️
net/gtcp/gtcp_conn.go	34.05% <0.00%> (+2.16%)	⬆️
net/gtcp/gtcp_pool.go	38.63% <0.00%> (+10.22%)	⬆️

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