Rename file

Author: kndehaan

docs/contrib/authoring-text-guidelines.md renamed to docs/contrib/authoring-texts.md

@@ -203,7 +203,7 @@ module.exports = {
       label: "Adding new features",
       collapsed: true,
       items: [
-        "contrib/authoring-text-guidelines",
+        "contrib/authoring-texts",
         "contrib/authoring-docs",
         "contrib/authoring-slider-texts",
         "contrib/authoring-gqueries",