Update assembly.md

Author: sangwoo-joh

content/english/hpc/architecture/assembly.md

@@ -49,7 +49,7 @@ Since there are far more differences between the architectures than just this on
 
 For historical reasons, instruction mnemonics in most assembly languages are very terse. Back when people used to write assembly by hand and repeatedly wrote the same set of common instructions, one less character to type was one step away from insanity.
 
-For example, `mov` is for "store/load a word", `inc` is for "increment by 1", `mul` for is "multiply", and `idiv` is for "integer division". You can look up the description of an instruction by its name in [one of x86 references](https://www.felixcloutier.com/x86/), but most instructions do what you'd think they do.
+For example, `mov` is for "store/load a word", `inc` is for "increment by 1", `mul` is for "multiply", and `idiv` is for "integer division". You can look up the description of an instruction by its name in [one of x86 references](https://www.felixcloutier.com/x86/), but most instructions do what you'd think they do.
 
 Most instructions write their result into the first operand, which can also be involved in the computation like in the `add eax, [rdi]` example we saw before. Operands can be either registers, constant values, or memory locations.