chore(blog): fix code in sanity blog post (#12201)

## Description
`createPages` doesn't trigger onCreatePage in the same plugin so I added
an extra bit of example code to demonstrate that.

## Update to
#11684

## Related Issues
Related to #5255

docs/blog/2019-03-01-localization-with-gatsby-and-sanity/index.md

@@ -222,18 +222,15 @@ export const query = graphql`
 
 ## Generating Pages with the Correct Context
 
-In the `gatsby-node.js` file you need to add a function that generates pages for each supported language with a path prefix for each, such as 'es' for Spanish, and 'fr' for French.
+In the `gatsby-node.js` file you need to add a function that generates pages for each supported language with a path prefix for each, such as 'es' for Spanish, and 'fr' for French. It needs to be called in `onCreatePage` so that every automatically generated page from your `pages` directory gets localized. It also needs to be added into the `createPages` to localize all of your dynamic content. This is needed as gatsby doesn't call `onCreatePage` for pages generated by the same plugin at the moment to avoid infinite loops.
 
 ```js:title=gatsby-node.js
 // Get your list of languages from somewhere, env file, config.json, etc
 // for sake of this snippet I am putting it here
 
 const extraLanguages = ["es"] // English is currently the default so it isn't needed here.
 
-exports.onCreatePage = ({ page, actions }) => {
-  const { createPage, deletePage } = actions
-
-  deletePage(page)
+const createLocalePage = (page, createPage) => {
   const { context, ...rest } = page
 
   createPage({
@@ -261,9 +258,32 @@ exports.onCreatePage = ({ page, actions }) => {
     })
   }
 }
+
+exports.createPages = ({ actions, graphql }) => {
+  const { createPage } = actions
+
+  // generate your dynamic content here...
+  const page = {
+    path: "some-page",
+    component: path.resolve(`./src/templates/some-page.js`),
+    context: {
+      slug: "some-page-slug",
+    },
+  }
+
+  createLocalePage(page, createPage)
+}
+
+exports.onCreatePage = ({ page, actions }) => {
+  const { createPage, deletePage } = actions
+
+  deletePage(page)
+
+  createLocalePage(page, createPage)
+}
 ```
 
-## Sanity.io + Gatsby.js + Easy Localization = Win
+## Sanity.io + Gatsby.js + Localization = Win
 
 If you haven't already started using [Sanity.io](https://www.sanity.io) as your content backend I encourage you to check it out. You and your content team will love it.
 

docs/blog/author.yaml

@@ -235,7 +235,7 @@
   avatar: avatars/daniel-lemay.jpg
   twitter: "@dslemay"
 - id: Travis Stanley
-  bio: Techlead for the Webteam at @ Fitplan. Adoring partner, father of three, Codemonkey, gamer, and writer. Thats about the gist of it.
+  bio: Techlead for the Webteam @ Fitplan. Adoring partner, father of three, Codemonkey, gamer, and writer. Thats about the gist of it.
   avatar: avatars/travis_stanley.jpg
   twitter: "@cpt_silverfox"
 - id: Katie Fujihara