Update python.rst (llvm#140333)

Fix code block formatting in section "The Decision Point Breakpoint
Commands"

Author: LauraElanorJones

lldb/docs/use/python.rst

@@ -330,9 +330,12 @@ decision to go right:
       process.Continue()
    else:
       print "Here is the problem; going right, should go left!"
-   Just as a reminder, LLDB is going to take this script and wrap it up in a function, like this:
 
 
+Just as a reminder, LLDB is going to take this script and wrap it up in a function, like this:
+
+::
+
    def some_unique_and_obscure_function_name (frame, bp_loc):
       global path
       if path[0] == 'R':