fix: fix typo for c.ShouldBindBodyWithPlain comment

[kingcanfish]

• fix typo for c.ShouldBindBodyWithPlain comment

ShouldBindBodyWithJSON is a shortcut for c.ShouldBindBodyWith(obj, binding.JSON). -> ShouldBindBodyWithPlain is a shortcut for c.ShouldBindBodyWith(obj, binding.Plain).

• by the way, fix some test functions in context_test.go for passing golang-lint

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.09%. Comparing base (3dc1cd6) to head (4b97320).
Report is 72 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4066      +/-   ##
==========================================
- Coverage   99.21%   99.09%   -0.12%     
==========================================
  Files          42       44       +2     
  Lines        3182     2887     -295     
==========================================
- Hits         3157     2861     -296     
+ Misses         17       15       -2     
- Partials        8       11       +3     

Flag	Coverage Δ
	?
-tags "sonic avx"	99.09% <ø> (?)
-tags go_json	99.09% <ø> (?)
-tags nomsgpack	99.08% <ø> (?)
go-1.18	?
go-1.19	?
go-1.20	?
go-1.21	99.09% <ø> (-0.12%)	⬇️
go-1.22	99.09% <ø> (?)
macos-latest	99.09% <ø> (-0.12%)	⬇️
ubuntu-latest	99.09% <ø> (-0.12%)	⬇️

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