Don't include improper comment for .ascii test

Author: chorman0773

src/inline-assembly.md

@@ -1260,7 +1260,6 @@ The following directives are guaranteed to be supported by the assembler:
 # #[cfg(target_arch = "x86_64")] {
   let bytes: *const u8;
   let len: usize;
-  // `push` and `pop` are UB when used with nostack
   unsafe { core::arch::asm!("jmp 3f", "2: .ascii \"Hello World!\"", "3: lea {bytes}, [2b+rip]", "mov {len}, 12", bytes = out(reg) bytes, len = out(reg) len); }
 
   let s = unsafe{core::str::from_utf8_unchecked(core::slice::from_raw_parts(bytes, len))};