Apply suggestion from @Copilot

Co-authored-by: Copilot <[email protected]>

Author: byrichardpowell

.changeset/curly-masks-feel.md

@@ -5,4 +5,4 @@
 '@shopify/shopify-api': patch
 ---
 
-Resolve bug with singal option on requests
+Resolve bug with signal option on requests