Update docs to reflect renamed function

src/lib.rs

@@ -350,7 +350,7 @@ impl Target {
  Ok(out_path)
  }
 
- /// Checks whether definition `definition` exists and has a value in the supplied `header`.
+ /// Checks whether a definition for type `type` exists in the supplied `header`.
  ///
  /// If it is not possible to include `header` without including other headers as well (or to
  /// include no headers), use [`has_type_in`](Self::has_type_in) to check for a
@@ -363,9 +363,9 @@ impl Target {
  .is_ok()
  }
 
- /// Checks whether definition `definition` exists and has a value in the supplied `headers`.
+ /// Checks whether a definition for type `type` exists in the supplied `headers`.
  ///
- /// The `headers` are included in the order they are provided. See
+ /// The `headers` are included in the order they are provided for testing. See
  /// [`has_type()`](Self::has_type) for more info.
  pub fn has_type_in(&self, definition: &str, headers: &[&str]) -> bool {
  let stub = format!("{}_multi", *headers.first().unwrap_or(&"has_type_in"));