doc: add doc comments to FailedTo

01.workspace/heave/src/str/failed_to.rs

@@ -1,12 +1,19 @@
 use crate::*;
 
+/// Represents the possible failures that can occur in the library.
 #[derive(Debug, PartialEq, PartialOrd, Eq, Ord, Clone, Copy, Hash)]
 pub enum E {
+    /// Failed to initialize the database.
     InitDatabase,
+    /// Failed to load data from the database.
     LoadFromDB,
+    /// Failed to map a database row to an attribute.
     MapAttribute,
+    /// Failed to map a database row to an entity.
     MapEntity,
+    /// Failed to persist the catalog to the database.
     PersistCatalog,
+    /// A failure originating from the underlying SQLite implementation.
     SQLite(sqlite::FailedTo),
 }