docs(gatsby): Minor tweak to warning message (#10778)

Follow-up to #10765


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packages/gatsby/src/internal-plugins/query-runner/query-watcher.js

@@ -152,7 +152,7 @@ const updateStateAndRunQueries = isFirstRun => {
       report.log(report.stripIndent`
 
         Exported queries are only executed for Page components. It's possible you're
-        trying to create a page in your gatsby-node.js and that's failing for some
+        trying to create pages in your gatsby-node.js and that's failing for some
         reason.
 
         If the failing component(s) is a regular component and not intended to be a page