Add note about operand interpolations

Author: chorman0773

src/inline-assembly.md

@@ -594,7 +594,7 @@ On x86, the following additional directives are guaranteed to be supported:
 - `.intel_syntax`
 - `.nops`
 
-Use of the `.att_syntax` and `.intel_syntax` with no parameters is supported, but the syntax must be restored to the option at entry (`.intel_syntax` without the `att_syntax` asm option, or `.att_syntax` with that option) or the behaviour is undefined (the output of the compiler may be corrupted as a result). Use of `.att_syntax` and `.intel_syntax` with an option (such as `.intel_syntax prefix` or `.att_syntax noprefix`) is unsupported and results in assembler-dependant behaviour. 
+Use of the `.att_syntax` and `.intel_syntax` with no parameters is supported, but the syntax must be restored to the option at entry (`.intel_syntax` without the `att_syntax` asm option, or `.att_syntax` with that option) or the behaviour is undefined (the output of the compiler may be corrupted as a result). Use of `.att_syntax` and `.intel_syntax` with an option (such as `.intel_syntax prefix` or `.att_syntax noprefix`) is unsupported and results in assembler-dependant behaviour. If operand interpolations are used between setting the syntax mode with one of these directives, and restoring it to the block's default, the behaviour is undefined.
 
 On x86 for `global_asm!` only, the following additional directives are guaranteed to be supported:
 - `.code16`