Fix typo: 'onany' -> 'on any'.

Author: rolfbjarne

spec/attributes.md

@@ -81,7 +81,7 @@ End Class
 End Interface
 ```
 
-If the attribute lacks a `System.AttributeUsage`, then the attribute can be placed onany target (equivalent to `AttributeTargets.All`). The `System.AttributeUsage` attribute has a variable initializer, `AllowMultiple`, which specifies whether the indicated attribute can be specified more than once for a given declaration. If `AllowMultiple` for an attribute is `True`, it is a *multiple-use attribute class*, and can be specified more than once on a declaration. If `AllowMultiple` for an attribute is `False` or unspecified for an attribute, it is a *single-use attribute class*, and can be specified at most once on a declaration.
+If the attribute lacks a `System.AttributeUsage`, then the attribute can be placed on any target (equivalent to `AttributeTargets.All`). The `System.AttributeUsage` attribute has a variable initializer, `AllowMultiple`, which specifies whether the indicated attribute can be specified more than once for a given declaration. If `AllowMultiple` for an attribute is `True`, it is a *multiple-use attribute class*, and can be specified more than once on a declaration. If `AllowMultiple` for an attribute is `False` or unspecified for an attribute, it is a *single-use attribute class*, and can be specified at most once on a declaration.
 
 The following example defines a multiple-use attribute class named `AuthorAttribute`: