x/cabi: fix README

Author: ydnar

x/cabi/README.md

@@ -2,8 +2,8 @@
 
 The `cabi` package contains a single exported WebAssembly function `cabi_realloc` ([Canonical ABI] realloc). To use, import this package with `_`:
 
-```
-import _ "github.com/bytecodealliance/wasm-tools-go/cabi"
+```go
+import _ "go.bytecodealliance.org/x/cabi"
 ```
 
 `cabi_realloc` is a WebAssembly [core function](https://www.w3.org/TR/wasm-core-2/syntax/modules.html#functions) that is validated to have the following core function type: