message: doc(changelog) Fix a typo.
diff: ### Added
  - [#1839](https://github.com/wasmerio/wasmer/pull/1839) Added support for Metering Middleware
  -- [#1837](https://github.com/wasmerio/wasmer/pull/1837) It is now possible to use exports of an `Intance` even after the `Instance` has been freed
  +- [#1837](https://github.com/wasmerio/wasmer/pull/1837) It is now possible to use exports of an `Instance` even after the `Instance` has been freed
  - [#1831](https://github.com/wasmerio/wasmer/pull/1831) Added support for Apple Silicon chips (`arm64-apple-darwin`)
  - [#1739](https://github.com/wasmerio/wasmer/pull/1739) Improved function environment setup via `WasmerEnv` proc macro.
  - [#1649](https://github.com/wasmerio/wasmer/pull/1649) Add outline of migration to 1.0.0 docs.
  