GeezerVison

… asserts in assert statement documentation

* The current simple_stmts.html#the-assert-statement text mentions -O as a tiny hyperlink over to #cmdoption-O but doesn't mention the PYTHONOPTIMIZE environment variable. This commit adds a hyperlink to it.

…ssues with code containng assert statements when optimization is enabled

Added a remainder that logic could break when optimization is enabled when using assert statements in code. Mentioned that it's considered best practice to not use assert statements to evaluate function variables.

Co-authored-by: Nice Zombies <[email protected]>

Co-authored-by: Nice Zombies <[email protected]>