fix: 'add' to 'foo' and minor typo in wasmtime.md (#303)

* 'add' to 'foo' and minor typo in wasmtime.md

This fixes an example which uses 'add' but where the surrounding text uses 'foo' as a function name. Foo seems more thematic.

There's also a minor typo ('and' is misspelled AFAICT).

* Replace 'foo' with 'add' in wasmtime.md

Use 'add' instead of 'foo' as per review comment. I agree that 'add' conveys a meaning more readily than a generic 'foo' function.

Author: og-syn

component-model/src/running-components/wasmtime.md

@@ -35,6 +35,6 @@ As of Wasmtime Version 33.0.0, there is [support for invoking components with cu
 As an example, if your component exports a function `add` which takes two numeric arguments, you can make use of this feature with the following command.
 
 ```sh
-wasmtime run --invoke 'foo(1, 2)' <path-to-wasm-file>
+wasmtime run --invoke 'add(1, 2)' <path-to-wasm-file>
 ```
-Make sure to wrap your invocation in single quotes abd to include parentheses, even if your function doesn't take any arguments. For a full list of ways to represent the various wit types when passing arguments to your exported function, visit the [WAVE repo](https://github.com/bytecodealliance/wasm-tools/tree/main/crates/wasm-wave).
+Make sure to wrap your invocation in single quotes and to include parentheses, even if your function doesn't take any arguments. For a full list of ways to represent the various wit types when passing arguments to your exported function, visit the [WAVE repo](https://github.com/bytecodealliance/wasm-tools/tree/main/crates/wasm-wave).