basic-syntax.xml Specify when it is better to skip closing PHP tags

It seemed to me that limiting the skipping of closing PHP tags to only files that contain only PHP code is misleading. After all, we skip closing tags in files with mixed content too, and the condition for skipping is not whether the file consists only of PHP code, but whether the file ends with PHP code

language/basic-syntax.xml

@@ -53,7 +53,7 @@
    </para>
 
    <para>
-    If a file contains only PHP code, it is preferable to omit the PHP closing tag
+    If a file ends with PHP code, it is preferable to omit the PHP closing tag
     at the end of the file.  This prevents accidental whitespace or new lines
     being added after the PHP closing tag, which may cause unwanted effects
     because PHP will start output buffering when there is no intention from