Typo in docs section "Debugging sanity and performance patterns"

[vkarak]

In the following code snippet

import re

# Read the test's output
with open(the_output_file, 'r') as f:
    test_output = ''.join(f.readlines())

# Evaluate the regular expression
re.find(the_regex_pattern, test_output)

re.find must be replaced with re.findall and re.MULTILINE should also be used.

CC: @flx42