fix missing o

Author: arBmind

index.md

@@ -8,7 +8,7 @@ Val aims to be:
 - **Fast**: Val is compiled AOT to machine code and relies on its type system to support in-place mutation and avoid unecessary memory allocations.
 - **Safe**: Val is memory safe in both single-threaded and concurrent settings. It does so by adopting mutable value semantics, a programming discipline that bans shared mutable state to uphold local reasoning.
 - **Simple**: Val borrows heavily from [Swift](https://swift.org) which has demonstrated a user-friendly approach to generic programming. Further, its user model emphasizes on value, leaving out the typical complexities associated with reference semantics (e.g., memory regions, lifetime annotations, etc.).
-- **Interoperable with C++**: Programming languages rarely survive in vacuum. Val aims to take advantage of the vast software capital of C++ by supporting full interperability.
+- **Interoperable with C++**: Programming languages rarely survive in vacuum. Val aims to take advantage of the vast software capital of C++ by supporting full interoperability.
 
 The [language tour](./language-tour.html) gives an overview of Val's most salient feature.
 The [specification](https://github.com/val-lang/specification/blob/main/spec.md) (work in progress) provides detailed information about Val's syntax and semantics.