CamelCase -> UpperCamelCase

The compiler will raise a warning unless it is UpperCamelCase. Since the warning is explicit about mentioning "upper", maybe the guide should too?

Author: cawibo

src/types/alias.md

@@ -1,7 +1,7 @@
 # Aliasing
 
 The `type` statement can be used to give a new name to an existing type. Types
-must have `CamelCase` names, or the compiler will raise a warning. The
+must have `UpperCamelCase` names, or the compiler will raise a warning. The
 exception to this rule are the primitive types: `usize`, `f32`, etc.
 
 ```rust,editable
@@ -33,4 +33,4 @@ is an alias for the `Result<T, IoError>` type.
 
 ### See also:
 
-[Attributes](../attribute.md)
+[Attributes](../attribute.md)