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[ty] document how the default value for python-version is determined (#18549)

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Co-authored-by: detachhead <detachhead@users.noreply.github.com>
Co-authored-by: Alex Waygood <alex.waygood@gmail.com>
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@ -106,9 +106,18 @@ The version should be specified as a string in the format `M.m` where `M` is the
and `m` is the minor (e.g. `"3.0"` or `"3.6"`).
If a version is provided, ty will generate errors if the source code makes use of language features
that are not supported in that version.
It will also understand conditionals based on comparisons with `sys.version_info`, such
as are commonly found in typeshed to reflect the differing contents of the standard
library across Python versions.
If a version is not specified, ty will try the following techniques in order of preference
to determine a value:
1. Check for the `project.requires-python` setting in a `pyproject.toml` file
and use the minimum version from the specified range
2. Check for an activated or configured virtual environment
and use the Python version of that environment
3. Fall back to the default value (see below)
For some language features, ty can also understand conditionals based on comparisons
with `sys.version_info`. These are commonly found in typeshed, for example,
to reflect the differing contents of the standard library across Python versions.
**Default value**: `"3.13"`