_design/import-and-export: fix typo

_design/import-and-export/README.md

@@ -1,5 +1,5 @@
 # import-and-export
 
-This design example contains a subset of the `wasi:clocks` package with a word that both *imports* and *exports* the `wasi:clocks/wall-clock` interface. The purpose of this example is to sketch out a mechanism for generating Go code whereby an interface (and types) can simultaneously be imported and exported.
+This design example contains a subset of the `wasi:clocks` package with a world that both *imports* and *exports* the `wasi:clocks/wall-clock` interface. The purpose of this example is to sketch out a mechanism for generating Go code whereby an interface (and types) can simultaneously be imported and exported.
 
 The source WIT file is [world.wit](./world.wit).