Revert "Add note to mention medlow also called small in certain toolchain implementation"

This reverts commit 621b074.

Author: kito-cheng

riscv-elf.adoc

@@ -59,9 +59,6 @@ lui a0, 0x80000 # a0 = 0xffffffff80000000
 addi a0, a0, -0x800 # a0 = a0 + -2048 = 0xFFFFFFFF7FFFF800
 ----
 
-NOTE: `medlow` also called small code model in certain toolchain implementation
-like LLVM.
-
 === Medium any code model
 
 The medium any code model, or `medany`, allows the code to address the range