Correct GraphQL variable name "text" to "type"

[FumioNonaka-ksj]

In the CodeSandbox example of "Mutations in Apollo Client", the correct variable name is "type" instead of "text".
https://codesandbox.io/s/mutations-example-app-final-tjoje

Checklist:

• If this PR is a new feature, please reference an issue where a consensus about the design was reached (not necessary for small changes)
• Make sure all of the significant new logic is covered by tests

[apollo-cla]

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[benjamn]

If type and text were being used inconsistently, we would welcome a fix, but it seems like you just changed text to type everywhere? I don't think I agree this find/replace improves the example, especially given the surrounding text.

The $text variable and the text field both refer to the text description of the to-do item. Of course a to-do item might also have a type, but that's not something this example needs, unless I'm missing something.

[FumioNonaka-ksj]

The variable name is inconsistent with "the completed version of the app". I spent more than an hour to have my trial app work. Then, please revise "Mutations > Example app final" of CodeSandbox.

[jpvajda]

I went ahead and doubled checked this change and this PR is a good adjustment as the examples we provide in code sandbox do use type so to be consistent this is a good change, especially when someone is working through our code samples and docs to learn. We appreciate the effort to fix this!

the complete version of the app is here: https://codesandbox.io/s/mutations-example-app-final-tjoje
the starter version of the app is here: https://codesandbox.io/s/mutations-example-app-start-gm7i5

they both use type

[benjamn]

Consistency across the tutorial materials is the goal, so I'm fine with switching to type instead of text as long as we're consistent!

[benjamn]

https://deploy-preview-9529--apollo-client-docs.netlify.app/data/mutations looks good to me!