PYTHON-3085 Audit consistent and correct types for _DocumentOut (mongodb#893)

Author: blink1073

.evergreen/config.yml

@@ -1726,7 +1726,7 @@ tasks:
           vars:
             VERSION: "latest"
             TOPOLOGY: "server"
-            PYTHON_BINARY: "/opt/mongodbtoolchain/v2/bin/python3"
+            PYTHON_BINARY: "/opt/mongodbtoolchain/v3/bin/python3"
         - func: "run tests"
 # }}}
     - name: "coverage-report"

.github/workflows/test-python.yml

@@ -64,6 +64,8 @@ jobs:
       - name: Run mypy
         run: |
           mypy --install-types --non-interactive bson gridfs tools pymongo
+          # Test overshadowed codec_options.py file
+          mypy --install-types --non-interactive bson/codec_options.py
           mypy --install-types --non-interactive --disable-error-code var-annotated --disable-error-code attr-defined --disable-error-code union-attr --disable-error-code assignment --disable-error-code no-redef --disable-error-code index --allow-redefinition --allow-untyped-globals --exclude "test/mypy_fails/*.*" test
 
   linkcheck:

README.rst

@@ -88,7 +88,7 @@ is incompatible with PyMongo.
 Dependencies
 ============
 
-PyMongo supports CPython 3.6+ and PyPy3.6+.
+PyMongo supports CPython 3.6.2+ and PyPy3.6+.
 
 Optional dependencies: