CLN: fix mypy stub and doc build for quarter deprecation

Add warn_quarter parameter to parsing.pyi stub. Add :okwarning: to
v0.17.0.rst ipython block that uses quarter strings.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jbrockmendel

doc/source/whatsnew/v0.17.0.rst

@@ -668,6 +668,7 @@ v0.17.0 can parse them as below. It works on ``DatetimeIndex`` also.
 New behavior:
 
 .. ipython:: python
+   :okwarning:
 
    pd.Timestamp("2012Q2")
    pd.Timestamp("2014")

pandas/_libs/tslibs/parsing.pyi

@@ -16,6 +16,7 @@ def parse_datetime_string_with_reso(
     freq: str | None = ...,
     dayfirst: bool | None = ...,
     yearfirst: bool | None = ...,
+    warn_quarter: bool = ...,
 ) -> tuple[datetime, str]: ...
 def _does_string_look_like_datetime(py_string: str) -> bool: ...
 def quarter_to_myear(year: int, quarter: int, freq: str) -> tuple[int, int]: ...