Fix typo: article 4 to tpo

Author: colmjude

application/templates/pages/guidance/specifications/tree-preservation-order.md

@@ -63,7 +63,7 @@ Example: `http://www.LPAwebsite.org.uk/tpo1.pdf`
 
 The URL of the webpage on your website that introduces the document.
 
-Each document should be linked to from a documentation webpage that includes a short description of the data and the document you’re linking to. Each tree preservation order should have a unique URL. This means you can create a separate page for each one, or you could list several on one page. If you do that, there must be a separate anchor link (fragment identifier) for each one. 
+Each document should be linked to from a documentation webpage that includes a short description of the data and the document you’re linking to. Each tree preservation order should have a unique URL. This means you can create a separate page for each one, or you could list several on one page. If you do that, there must be a separate anchor link (fragment identifier) for each one.
 
 This means each section of your page should have its own URL. Most publishing systems will allow you to use a hashtag to create the identifiers for each tree preservation order you list - as in the examples shown.
 
@@ -73,7 +73,7 @@ One tree preservation order per page:
 
 `http://www.LPAwebsite.org.uk/data/treepreservationorders/smithroad`
 
-More than one article 4 direction per page with an anchor link for each one:
+More than one tree preservation order per page with an anchor link for each one:
 
 `http://www.LPAwebsite.org.uk/data/treepreservationorders#smithroad`