Update training-slides/src/compound-types.md

training-slides/src/compound-types.md

@@ -153,7 +153,7 @@ fn main() {
 
 Note:
 
-The tag in an enum specifies which variant is currently valid, and is stored the
+The tag in an enum specifies which variant is currently valid, and is stored as the
 smallest integer the compiler can get away with - it depends how many variants you
 have. Of course, if none of the variants have any data, the enum is *just* the tag.