nasmdoc: document %substr, `...`
nasmdoc: document %substr, `...`

letolabs/nasm,Distrotech/nasm,techkey/nasm,projedi/nasm,Distrotech/nasm,techkey/nasm,projedi/nasm,turingstudio/nasm,projedi/nasm,turingstudio/nasm,techkey/nasm,letolabs/nasm,techkey/nasm,projedi/nasm,letolabs/nasm,Distrotech/nasm,turingstudio/nasm,techkey/nasm,projedi/nasm,turingstudio/nasm,Distrotech/nasm