Fix minor document errors (#6533)

## Summary

Fix minor errors in the sample codes of some rules.

## Test Plan

N/A (Just fix document typos.)

crates/ruff/src/rules/flake8_bandit/rules/suspicious_function_call.rs

@@ -76,7 +76,7 @@ impl Violation for SuspiciousPickleUsage {
 /// import marshal
 ///
 /// with open("foo.marshal", "rb") as file:
-///     foo = pickle.load(file)
+///     foo = marshal.load(file)
 /// ```
 ///
 /// Use instead:

crates/ruff/src/rules/flake8_simplify/rules/ast_bool_op.rs

@@ -152,7 +152,7 @@ impl AlwaysAutofixableViolation for ExprAndNotExpr {
 ///
 /// ## Example
 /// ```python
-/// x and not x
+/// x or not x
 /// ```
 ///
 /// ## References