fix small typo

Author: manojo

docs/docs/reference/metaprogramming/staging.md

@@ -4,7 +4,7 @@ title: "Multi-Stage Programming"
 ---
 
 The framework expresses at the same time compile-time meta-programming and
-multi-staging programming. We can think of compile-time meta-programming as a
+multi-stage programming. We can think of compile-time meta-programming as a
 two stage compilation process: one that we write the code in top-level splices,
 that will be used for code generation (macros) and one that will perform all
 necessecary evaluations at compile-time and an object program that we will run