Fix some errors on configuring-graphql-client-for-user-session.md

[zalito12]

Some typos and errors with Apollo Link examples

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What does this implement/fix? Explain your changes.

Fix errors on documentation

Does this close any currently open issues?

No

Any relevant logs, error output, GraphiQL screenshots, etc?

No

Any other comments?

No

[kidunot89]

@zalito12 Thanks for taking the time to fix this.

[alexismo]

@zalito12 Trying your updated version of createUpdateLink, I'm getting

⨯ TypeError: forward is not a function
    at createUpdateLink (webpack-internal:///./apollo/client.js:118:12)

[zalito12]

@zalito12 Trying your updated version of createUpdateLink, I'm getting

⨯ TypeError: forward is not a function
    at createUpdateLink (webpack-internal:///./apollo/client.js:118:12)

Could you provide more context? What are you passing as forward? I just removed a typo =>