chore(docs): Fix typo in createPages doc (#30343)

The action is `createPage` and not `createPages`.

Co-authored-by: gatsbybot <mathews.kyle+gatsbybot@gmail.com>

packages/gatsby/src/utils/api-node-docs.ts

@@ -14,7 +14,7 @@ export const resolvableExtensions = true
  *
  * @param {object} $0 See the [documentation for `Node API Helpers` for more details](/docs/node-api-helpers)
  * @param {Actions} $0.actions See the [list of documented actions](/docs/actions)
- * @param {function} $0.actions.createPages [Documentation for this action](/docs/actions/#createPage)
+ * @param {function} $0.actions.createPage [Documentation for this action](/docs/actions/#createPage)
  * @param {function} $0.graphql: Query GraphQL API. See [examples here](/docs/creating-and-modifying-pages/#creating-pages-in-gatsby-nodejs)
  * @param {GatsbyReporter} $0.reporter Log issues. See [GatsbyReporter documentation](/docs/node-api-helpers/#GatsbyReporter) for more details
  * @returns {Promise<void>} No return value required, but the caller will `await` any promise that's returned