gh-123905: Update TOML description to include version number (GH-123906)

Update TOML description to include version number

There is some movement, currently blocked, that would update the TOML spec to 1.1.0; this would include breaking changes to what characters are allowed. Thus, it is worthwhile for the library page to be clear which version is implemented here.

Co-authored-by: Paul Hoffman <[email protected]>

Author: encukou

Doc/library/tomllib.rst

@@ -13,7 +13,7 @@
 
 --------------
 
-This module provides an interface for parsing TOML (Tom's Obvious Minimal
+This module provides an interface for parsing TOML 1.0.0 (Tom's Obvious Minimal
 Language, `https://toml.io <https://toml.io/en/>`_). This module does not
 support writing TOML.