add comment of wasm

[LXPWing]

What this PR does:
add comment of wasm #112

[codecov]

Codecov Report

Merging #370 (d491d3f) into main (3cf8915) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #370   +/-   ##
=======================================
  Coverage   58.03%   58.03%           
=======================================
  Files         106      106           
  Lines        5636     5636           
=======================================
  Hits         3271     3271           
  Misses       2030     2030           
  Partials      335      335           

Impacted Files	Coverage Δ
pkg/wasm/abi.go	8.69% <ø> (ø)
pkg/wasm/config.go	48.93% <ø> (ø)
pkg/wasm/dispatch.go	0.00% <ø> (ø)
pkg/wasm/factory.go	24.48% <ø> (ø)
pkg/wasm/filter.go	0.00% <ø> (ø)
pkg/wasm/imports.go	65.21% <ø> (ø)

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[seeflood]

lgtm.
Thanks for your contribution!
I think we can ignore the test coverage warning,since this PR doesn't change code.

[wenxuwan]

LGTM