doc: minor editorial change
doc: minor editorial change

Use the terms "defined" and "expanded" for single-line macros more
consistently.

Signed-off-by: H. Peter Anvin <8a453bad9912ffe59bc0f0b8abe03df9be19379e@zytor.com>

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