replace block 'tip' to 'caution

Author: aitboudad

components/config/definition.rst

@@ -325,9 +325,10 @@ The separator used in keys is typically ``_`` in Yaml and ``-`` in XML. For
 example, ``auto_connect`` in Yaml and ``auto-connect``. The normalization would
 make both of these ``auto_connect``.
 
-.. tip::
+.. caution::
 
-    The target key will not be altered if it's mixed like ``foo-bar_moo`` or if it already exists.
+    The target key will not be altered if it's mixed like ``foo-bar_moo`` or if
+    it already exists.
 
 Another difference between Yaml and XML is in the way arrays of values may
 be represented. In Yaml you may have: