Drop flake8 suppressions that are no longer needed

+ Remove the comments that documented those old suppressions
+ Format the .flake8 file more readably

.flake8

@@ -1,38 +1,26 @@
 [flake8]
+
 show-source = True
-count= True
+count = True
 statistics = True
-# E265 = comment blocks like @{ section, which it can't handle
+
 # E266 = too many leading '#' for block comment
 # E731 = do not assign a lambda expression, use a def
-# W293 = Blank line contains whitespace
-# W504 = Line break after operator
-# E704 = multiple statements in one line  - used for @override
 # TC002 = move third party import to TYPE_CHECKING
-# ANN = flake8-annotations
 # TC, TC2 = flake8-type-checking
-# D = flake8-docstrings
 
 # select = C,E,F,W ANN, TC, TC2  # to enable code. Disabled if not listed, including builtin codes
 enable-extensions = TC, TC2  # only needed for extensions not enabled by default
 
-ignore = E265,E266,E731,E704,
-         W293, W504,
-         ANN0 ANN1 ANN2,
-         TC002,
-         TC0, TC1, TC2
-         # B,
-         A,
-         D,
-         RST, RST3
+ignore = E266, E731
 
-exclude = .tox,.venv,build,dist,doc,git/ext/
+exclude = .tox, .venv, build, dist, doc, git/ext/
 
 rst-roles =  # for flake8-RST-docstrings
-    attr,class,func,meth,mod,obj,ref,term,var  # used by sphinx
+    attr, class, func, meth, mod, obj, ref, term, var  # used by sphinx
 
 min-python-version = 3.7.0
 
 # for `black` compatibility
 max-line-length = 120
-extend-ignore = E203,W503
+extend-ignore = E203, W503