Match variable names to arguments

Author: kasparia

component-model/examples/tutorial/adder/src/lib.rs

@@ -7,7 +7,7 @@ struct Component;
 
 impl Guest for Component {
     fn add(x: u32, y: u32) -> u32 {
-        a + b
+        x + y
     }
 }
 

component-model/src/language-support/rust.md

@@ -148,7 +148,7 @@ struct Component;
 
 impl Guest for Component {
     fn add(x: u32, y: u32) -> u32 {
-        a + b
+        x + y
     }
 }
 ```