Merge pull request #346 from goldenraisin/fix-balances

fix: update balances to account

Author: d0cd

documentation/leo/03_language.md

@@ -157,7 +157,7 @@ import foo.aleo;
 
 program hello.aleo {
     const FOO: u64 = 1u64;
-    mapping balances: address => u64;
+    mapping account: address => u64;
 
     record token {
         owner: address,