DOC: remove an extra colon (#34533)

Author: partev

doc/source/user_guide/gotchas.rst

@@ -321,7 +321,7 @@ Byte-ordering issues
 --------------------
 Occasionally you may have to deal with data that were created on a machine with
 a different byte order than the one on which you are running Python. A common
-symptom of this issue is an error like:::
+symptom of this issue is an error like::
 
     Traceback
         ...