Fix typos in error_codes
`observedin` should be `observed in`.
# }
```
-The same applies to transmutes to `*mut fn()`, which were observedin practice.
+The same applies to transmutes to `*mut fn()`, which were observed in practice.
Note though that use of this type is generally incorrect.
The intention is typically to describe a function pointer, but just `fn()`
alone suffices for that. `*mut fn()` is a pointer to a fn pointer.
let f: extern "C" fn(*mut i32) = transmute(foo as usize); // works too
```
-The same applies to transmutes to `*mut fn()`, which were observedin practice.
+The same applies to transmutes to `*mut fn()`, which were observed in practice.
Note though that use of this type is generally incorrect.
The intention is typically to describe a function pointer, but just `fn()`
alone suffices for that. `*mut fn()` is a pointer to a fn pointer.