Merge #15249: Docs: Update python docs to reflect that wildcard imports are disallowed

f618c58 Docs: Update python docs to reflect that wildcard imports are disallowed (Ben Woosley)

Pull request description:

  These have been disallowed via flake8 since: #13054

Tree-SHA512: f41651fd883e3786a7e87c4aa4c54749308e576287f2f88da3f1d8d0f59e14519d99061f1efd05b8745f495f87a14286cea576f1507d10ccd226f8cf2f2b3cc8

Author: MarcoFalke

test/functional/README.md

@@ -26,7 +26,7 @@ don't have test cases for.
   The Travis linter also checks this, but [possibly not in all cases](https://github.com/bitcoin/bitcoin/pull/14884#discussion_r239585126).
 - See [the python lint script](/test/lint/lint-python.sh) that checks for violations that
   could lead to bugs and issues in the test code.
-- Avoid wildcard imports where possible
+- Avoid wildcard imports
 - Use a module-level docstring to describe what the test is testing, and how it
   is testing it.
 - When subclassing the BitcoinTestFramwork, place overrides for the

test/functional/example_test.py

@@ -13,7 +13,7 @@
 # libraries then local imports).
 from collections import defaultdict
 
-# Avoid wildcard * imports if possible
+# Avoid wildcard * imports
 from test_framework.blocktools import (create_block, create_coinbase)
 from test_framework.messages import CInv
 from test_framework.mininode import (