Fix sorting of entity names.

src/context/global_settings.rs

@@ -50,6 +50,8 @@ pub struct GlobalSettings<'g, 's> {
 
     /// The special characters that can be written in org-mode like \infin for the infinity symbol.
     ///
+    /// MUST be sorted with the largest names first. Otherwise the parser may match a shorter substring of a longer entity.
+    ///
     /// Corresponds to org-entities elisp variable.
     pub entities: &'g [EntityDefinition<'s>],
 }