Fix documentation for shared method in BevyManifest (#21312)

Follow up to #20630.

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Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
Co-authored-by: Dimitrios Loukadakis <dloukadakis@users.noreply.github.com>

Author: 3 people

crates/bevy_macro_utils/src/bevy_manifest.rs

@@ -20,7 +20,7 @@ pub struct BevyManifest {
 const BEVY: &str = "bevy";
 
 impl BevyManifest {
-    /// Returns a global shared instance of the [`BevyManifest`] struct.
+    /// Calls `f` with a global shared instance of the [`BevyManifest`] struct.
     pub fn shared<R>(f: impl FnOnce(&BevyManifest) -> R) -> R {
         static MANIFESTS: RwLock<BTreeMap<PathBuf, BevyManifest>> = RwLock::new(BTreeMap::new());
         let manifest_path = Self::get_manifest_path();