Add "Notebook behavior" section for F704, PLE1142 (#14266)

## Summary

Move the relevant contents into "Notebook behavior" section similar to
other rules.

crates/ruff_linter/src/rules/pyflakes/rules/yield_outside_function.rs

@@ -31,15 +31,16 @@ impl fmt::Display for DeferralKeyword {
 /// The use of `yield`, `yield from`, or `await` outside of a function will
 /// raise a `SyntaxError`.
 ///
-/// As an exception, `await` is allowed at the top level of a Jupyter notebook
-/// (see: [autoawait]).
-///
 /// ## Example
 /// ```python
 /// class Foo:
 ///     yield 1
 /// ```
 ///
+/// ## Notebook behavior
+/// As an exception, `await` is allowed at the top level of a Jupyter notebook
+/// (see: [autoawait]).
+///
 /// ## References
 /// - [Python documentation: `yield`](https://docs.python.org/3/reference/simple_stmts.html#the-yield-statement)
 ///

crates/ruff_linter/src/rules/pylint/rules/await_outside_async.rs

@@ -11,9 +11,6 @@ use crate::checkers::ast::Checker;
 /// ## Why is this bad?
 /// Using `await` outside an `async` function is a syntax error.
 ///
-/// As an exception, `await` is allowed at the top level of a Jupyter notebook
-/// (see: [autoawait]).
-///
 /// ## Example
 /// ```python
 /// import asyncio
@@ -32,6 +29,10 @@ use crate::checkers::ast::Checker;
 ///     await asyncio.sleep(1)
 /// ```
 ///
+/// ## Notebook behavior
+/// As an exception, `await` is allowed at the top level of a Jupyter notebook
+/// (see: [autoawait]).
+///
 /// ## References
 /// - [Python documentation: Await expression](https://docs.python.org/3/reference/expressions.html#await)
 /// - [PEP 492: Await Expression](https://peps.python.org/pep-0492/#await-expression)