[DOCS] Fix API Quick Reference rollup attribute for Asciidoctor (#42403)

docs/reference/rollup/api-quickref.asciidoc

@@ -5,7 +5,7 @@
 
 experimental[]
 
-Most {rollup} endpoints have the following base:
+Most rollup endpoints have the following base:
 
 [source,js]
 ----