Fix title of GraphQL examples page

Kati Paizeerequested to merge
kpaizee-main-patch-53240 into main

The left nav currently calls this page 'GraphQL style guide'. However, it is not a style guide for GraphQL. It explains how to add GraphQL examples to the docs. This MR changes the title to better reflect the purpose of this page.

I'll create a separate MR to improve the title of the page itself.

Related issue: gitlab#355873 (closed)

Edited by Kati Paizee

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