doc: fix broken code blocks

Caused by 4588653. I disabled the
offending Ruff rule.

Fix #12437.

pyproject.toml

@@ -133,6 +133,7 @@ lint.ignore = [
     "D401", # First line of docstring should be in imperative mood
     "D402", # First line should not be the function's signature
     "D404", # First word of the docstring should not be "This"
+    "D412", # No blank lines allowed between a section header and its content
     "D415", # First line should end with a period, question mark, or exclamation point
     # pytest can do weird low-level things, and we usually know
     # what we're doing when we use type(..) is ...

src/_pytest/capture.py

@@ -983,6 +983,7 @@ def capsys(request: SubRequest) -> Generator[CaptureFixture[str], None, None]:
     Returns an instance of :class:`CaptureFixture[str] <pytest.CaptureFixture>`.
 
     Example:
+
     .. code-block:: python
 
         def test_output(capsys):
@@ -1010,6 +1011,7 @@ def capsysbinary(request: SubRequest) -> Generator[CaptureFixture[bytes], None,
     Returns an instance of :class:`CaptureFixture[bytes] <pytest.CaptureFixture>`.
 
     Example:
+
     .. code-block:: python
 
         def test_output(capsysbinary):
@@ -1037,6 +1039,7 @@ def capfd(request: SubRequest) -> Generator[CaptureFixture[str], None, None]:
     Returns an instance of :class:`CaptureFixture[str] <pytest.CaptureFixture>`.
 
     Example:
+
     .. code-block:: python
 
         def test_system_echo(capfd):
@@ -1064,6 +1067,7 @@ def capfdbinary(request: SubRequest) -> Generator[CaptureFixture[bytes], None, N
     Returns an instance of :class:`CaptureFixture[bytes] <pytest.CaptureFixture>`.
 
     Example:
+
     .. code-block:: python
 
         def test_system_echo(capfdbinary):

src/_pytest/config/__init__.py

@@ -1735,6 +1735,7 @@ def get_verbosity(self, verbosity_type: Optional[str] = None) -> int:
         can be used to explicitly use the global verbosity level.
 
         Example:
+
         .. code-block:: ini
 
             # content of pytest.ini

src/_pytest/monkeypatch.py

@@ -142,6 +142,7 @@ def context(cls) -> Generator["MonkeyPatch", None, None]:
         which undoes any patching done inside the ``with`` block upon exit.
 
         Example:
+
         .. code-block:: python
 
             import functools

src/_pytest/pytester.py

@@ -805,6 +805,7 @@ def makefile(self, ext: str, *args: str, **kwargs: str) -> Path:
             The first created file.
 
         Examples:
+
         .. code-block:: python
 
             pytester.makefile(".txt", "line1", "line2")
@@ -858,6 +859,7 @@ def makepyfile(self, *args, **kwargs) -> Path:
         existing files.
 
         Examples:
+
         .. code-block:: python
 
             def test_something(pytester):
@@ -877,6 +879,7 @@ def maketxtfile(self, *args, **kwargs) -> Path:
         existing files.
 
         Examples:
+
         .. code-block:: python
 
             def test_something(pytester):