Update expect's docstring

Author: kastiglione

lldb/packages/Python/lldbsuite/test/lldbtest.py

@@ -2356,8 +2356,9 @@ def expect(
         matches the patterns contained in 'patterns'.
 
         When matching is true and ordered is true, which are both the default,
-        the strings in the substrs array have to appear in the command output
-        in the order in which they appear in the array.
+        the strings in the substrs array, and regex in the patterns array, have
+        to appear in the command output in the order in which they appear in
+        their respective array.
 
         If the keyword argument error is set to True, it signifies that the API
         client is expecting the command to fail.  In this case, the error stream