fix: clarify reference argument behavior in function calls (#9019)

Author: zeevick10

docs/reference/src/components/cairo/modules/language_constructs/pages/function-calls.adoc

@@ -40,7 +40,7 @@ The syntax for a reference argument is xref:lvalue.adoc[`ref lvalue`]. The type
 match the type of the reference parameter.
 The behavior of passing a reference argument is similar to the
 xref:assignment-statement.adoc[assignment].
-`lvalue` is passed to the function and then reassigned to when the function returns.
+`lvalue` is passed to the function and then reassigned when the function returns.
 Example: `increment(ref a.b)`.
 
 [source,rust]