message: doc(runtime-c-api) Improve documentation of `wasmer_value_tag`.
diff: use wasmer_runtime::Value;
  use wasmer_runtime_core::types::Type;
  +/// Represents all possibles WebAssembly value types.
  +///
  +/// See `wasmer_value_t` to get a complete example.
  #[allow(non_camel_case_types)]
  #[repr(u32)]
  #[derive(Clone)]
  pub enum wasmer_value_tag {
  + /// Represents the `i32` WebAssembly type.
  WASM_I32,
  +
  + /// Represents the `i64` WebAssembly type.
  WASM_I64,
  +
  + /// Represents the `f32` WebAssembly type.
  WASM_F32,
  +
  + /// Represents the `f64` WebAssembly type.
  WASM_F64,
  }
  