corrected grammatical error.

wickedjargon · ehuss · commit 23cbc7d57940 · 2025-01-23T10:59:55.000-08:00
diff --git a/src/references.md b/src/references.md
@@ -1,6 +1,6 @@
 # References
 
-There are two kinds of reference:
+There are two kinds of references:
 
 * Shared reference: `&`
 * Mutable reference: `&mut`
