[FR] Improve the documentation for the wasm plugin

[wuzongling]

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Description

tinygo build -o wasm.wasm -gc=custom -tags=custommalloc -target=wasi -panic=trap -scheduler=none -no-debug ./main.go 这个命令在gonland 1.9 tinygo tinygo version 0.29.0 darwin/amd64 (using go version go1.18.10 and LLVM version 15.0.0) 是会运行报错的：

panic: missing core function "runtime.free"

goroutine 67 [running]: github.com/tinygo-org/tinygo/transform.Optimize({0x7f57a00c7340?}, 0xc000158510, 0x2, 0x844759?, 0x5) /__w/tinygo/tinygo/transform/optimizer.go:70 +0xdf5 github.com/tinygo-org/tinygo/builder.optimizeProgram({0x7f57a00c7340?}, 0xc000158510) /__w/tinygo/tinygo/builder/build.go:1068 +0x13f github.com/tinygo-org/tinygo/builder.Build.func5(0xc00afae300) /__w/tinygo/tinygo/builder/build.go:572 +0x61d github.com/tinygo-org/tinygo/builder.runJob(0xc00afbb980, 0x0?) /__w/tinygo/tinygo/builder/jobs.go:222 +0x4d created by github.com/tinygo-org/tinygo/builder.runJobs in goroutine 1 /__w/tinygo/tinygo/builder/jobs.go:123 +0x5bd

    如果goland 版本是1.8 编译后的文件会多了random_get的定义，执行wasm 是就会出现 unknown import: `wasi_snapshot_preview1::random_get` has not been defined错误
     
  goland 1.9 版本执行tinygo  build -o wasm.wasm  -target wasi  -panic=trap -scheduler=none -no-debug ./http.go 是可以编译运行成功的。 

所以社区可以完善wasm 编译时指定的goland tinygo 版本，也可以多一个tinygo docker 编译的方式

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