Don't treat sphinx warnings as errors

Workaround for python/cpython#100520 (rst syntax error in configparser docstrings), which was fixed in CPython 3.10+.
Docutils raises warnings about the invalid docstrings, and `-W` instructs sphinx to treat this as errors. We can't control or silence these warnings, so we accept them and don't treat them as errors.

See the discussion in #2060 for details.

Author: NMertsch

doc/Makefile

@@ -3,7 +3,7 @@
 
 # You can set these variables from the command line.
 BUILDDIR      = build
-SPHINXOPTS    = -W
+SPHINXOPTS    =
 SPHINXBUILD   = sphinx-build
 PAPER         =
 

git/config.py

@@ -87,15 +87,15 @@ def __new__(cls, name: str, bases: Tuple, clsdict: Dict[str, Any]) -> "MetaParse
             mutating_methods = clsdict[kmm]
             for base in bases:
                 methods = (t for t in inspect.getmembers(base, inspect.isroutine) if not t[0].startswith("_"))
-                for name, method in methods:
-                    if name in clsdict:
+                for method_name, method in methods:
+                    if method_name in clsdict:
                         continue
                     method_with_values = needs_values(method)
-                    if name in mutating_methods:
+                    if method_name in mutating_methods:
                         method_with_values = set_dirty_and_flush_changes(method_with_values)
                     # END mutating methods handling
 
-                    clsdict[name] = method_with_values
+                    clsdict[method_name] = method_with_values
                 # END for each name/method pair
             # END for each base
         # END if mutating methods configuration is set