Apply suggestions from code review

Co-authored-by: Daniel Szoke <[email protected]>

scripts/populate_tox/README.md

@@ -95,7 +95,7 @@ Python versions, you can say:
     ...
 }
 ```
-
+This key is optional.
 ### `python`
 
 Sometimes, the whole test suite should only run on specific Python versions.
@@ -110,8 +110,9 @@ For example, if you want AIOHTTP tests to only run on Python 3.7+, you can say:
 }
 ```
 
-Specifying `python` is discouraged as the script itself finds out which
-Python versions are supported by the package. However, if a package has broken
+The `python` key is optional, and when possible, it should be omitted. The script
+should automatically detect which Python versions the package supports.
+However, if a package has broken
 metadata or the SDK is explicitly not supporting some packages on specific
 Python versions (because of, for example, broken context vars), the `python`
 key can be used.

scripts/populate_tox/populate_tox.py

@@ -401,7 +401,7 @@ def write_tox_file(packages: dict) -> None:
         file.write("\n")
 
 
-def _get_package_name(integration: str) -> Tuple[str, Optional[str]]:
+def _get_package_name(integration: str) -> tuple[str, Optional[str]]:
     package = TEST_SUITE_CONFIG[integration]["package"]
     extra = None
     if "[" in package: