DOC: Fixes flake8 issues in whatsnew v0.13.* pandas-dev#24256

Rollback strange changes to setup.cfg and hopefully resolve
the merge conflict.

Author: Seuss27

setup.cfg

@@ -45,6 +45,17 @@ ignore = E402,  # module level import not at top of file
          E703,  # statement ends with a semicolon
 
 exclude =
+	doc/source/whatsnew/v0.7.0.rst
+    doc/source/whatsnew/v0.7.3.rst
+    doc/source/whatsnew/v0.8.0.rst
+    doc/source/whatsnew/v0.9.0.rst
+    doc/source/whatsnew/v0.9.1.rst
+    doc/source/whatsnew/v0.10.0.rst
+    doc/source/whatsnew/v0.10.1.rst
+    doc/source/whatsnew/v0.11.0.rst
+    doc/source/whatsnew/v0.12.0.rst
+    doc/source/whatsnew/v0.14.0.rst
+    doc/source/whatsnew/v0.14.1.rst
     doc/source/whatsnew/v0.15.0.rst
     doc/source/whatsnew/v0.15.1.rst
     doc/source/whatsnew/v0.15.2.rst
@@ -59,6 +70,10 @@ exclude =
     doc/source/contributing_docstring.rst
     doc/source/enhancingperf.rst
     doc/source/groupby.rst
+	doc/source/indexing.rst
+    doc/source/missing_data.rst
+    doc/source/options.rst
+    doc/source/release.rst
 
 
 [yapf]
@@ -116,7 +131,7 @@ known_post_core=pandas.tseries,pandas.io,pandas.plotting
 sections=FUTURE,STDLIB,THIRDPARTY,PRE_CORE,DTYPES,FIRSTPARTY,POST_CORE,LOCALFOLDER
 
 known_first_party=pandas
-known_third_party=Cython,numpy,dateutil,matplotlib,python-dateutil,pytz,pyarrow,pytest
+known_third_party=Cython,numpy,python-dateutil,pytz,pyarrow,pytest
 multi_line_output=4
 force_grid_wrap=0
 combine_as_imports=True