Remove the 'Development version' section

Author: srittau

CONTRIBUTING.md

@@ -24,13 +24,6 @@ Starting with version 4.0.0, `typing_extensions` uses
 [Semantic Versioning](https://semver.org/). See the documentation
 for more detail.
 
-## Development version
-
-After a release the patch version is increased in [pyproject.toml](/pyproject.toml) and
-appended with a `.dev0` suffix, e.g. `4.0.1.dev0`.
-
-When a new feature is added we will increase the minor version once between releases. For example, from 4.0.1.dev0 to 4.1.0.dev0.
-
 # Type stubs
 
 A stub file for `typing_extensions` is maintained
@@ -113,4 +106,4 @@ pipx run pre-commit run -a
 - Release automation will finish the release. You'll have to manually
   approve the last step before upload.
 
-- After the release has been published on PyPI upgrade the version in number in [pyproject.toml](/pyproject.toml) to a `dev` version of the next planned release. For example, change 4.1.1 to 4.1.2.dev0, see also [Development versions](#development-version).
+- After the release has been published on PyPI upgrade the version in number in [pyproject.toml](/pyproject.toml) to a `dev` version of the next planned release. For example, change 4.1.1 to 4.1.2.dev0.