[TASK] Rename to TypoScript Explained

Releases: 13.4

Author: linawolf

Documentation/guides.xml

@@ -13,7 +13,7 @@
                interlink-shortcode="t3tsref"
                confval-default="TypoScript"
     />
-    <project title="TypoScript Reference"
+    <project title="TypoScript Explained"
              release="13.4"
              version="13.4"
              copyright="since 2012 by the TYPO3 contributors"