* Clean up How Queries Work

* Update docs/docs/query-behind-the-scenes.md

Co-authored-by: Marcy Sutton <marcy@gatsbyjs.com>

* Update docs/docs/query-behind-the-scenes.md

Co-authored-by: Aisha Blake <aisha.g.blake@gmail.com>

* Update docs/docs/query-behind-the-scenes.md

Co-authored-by: Marcy Sutton <marcy@gatsbyjs.com>

* Update docs/docs/query-behind-the-scenes.md

* Update docs/docs/query-behind-the-scenes.md

* fix: remove trailing whitespace

Co-authored-by: Megan Sullivan <megan@gatsbyjs.com>
Co-authored-by: Marcy Sutton <marcy@gatsbyjs.com>
Co-authored-by: Aisha Blake <aisha.g.blake@gmail.com>

…27597)

* perf(gatsby-source-filesystem): dont JSON parse/stringify the node

* Explicit serialization, remove redundant keys (they are splat anyways)

* Explicitly splat stats object

* Add a snapshot test

* Attempt to make the test more generic so it works on Windows too

 - gatsby-admin@0.1.176
 - gatsby-source-contentful@3.0.5
 - gatsby-source-drupal@3.5.40
 - gatsby-source-filesystem@2.3.37
 - gatsby-source-shopify@3.2.39
 - gatsby-source-wordpress@3.3.41
 - gatsby@2.24.88