Change example for directive order to use Query or Mutation, not type system

[rivantsov]

Directives Order Is Significant sub-section is in section "2. Language", which talks about Query language. The directive order example surprisingly uses a type definition, while type system and its SDL had not been introduced yet, they are coming in chapter 3.

Suggest to change it to Query or Mutation example with multiple directives. I could not come up with decent example, just put a comment there, suggestions are welcome.

Note: even if we change chapters order (SDL first, Query language after), it is still better to have an example matching the area that is chapter's focus

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