Fix minor typos (quii#206)

Author: ʇɹǝqƃǝᴉs puɐloɹ

structs-methods-and-interfaces.md

@@ -504,9 +504,9 @@ When you scan this
 {Triangle{12, 6}, 36.0},
 ```
 
-It's not immediately clear what all the numbers represent and you should be aiming for your tests to easily understood.
+It's not immediately clear what all the numbers represent and you should be aiming for your tests to be easily understood.
 
-So far you've only been shown one syntax for creating instances of structs `MyStruct{val1, val2}` but you can optionally name the fields.
+So far you've only been shown syntax for creating instances of structs `MyStruct{val1, val2}` but you can optionally name the fields.
 
 Let's see what it looks like