[GR-34213] Update README.md and CONTRIBUTING.md

PullRequest: graalpython/1988

Author: phoeinx

README.md

@@ -13,8 +13,8 @@ implementation is made available for experimentation and curious end-users.
 
 The easiest option to try GraalPython is
 [Pyenv](https://github.com/pyenv/pyenv/), the Python version manager. It allows
-you to easily install different GraalPython releases. To get version 20.2, for
-example, just run `pyenv install graalpython-20.2`.
+you to easily install different GraalPython releases. To get version 21.2.0, for
+example, just run `pyenv install graalpython-21.2.0`.
 
 To try GraalPython with a full GraalVM, including the support for Java embedding
 and interop with other languages, you can use the bundled releases from

docs/contributor/CONTRIBUTING.md

@@ -42,9 +42,9 @@ of useable development setups with that, but it's not something we support.
 
 Besides the source code of the Python interpreter, we have some useful `mx`
 functions defined under the `mx.graalpython` directory. As you make changes, you
-can test always test them with `mx build && mx python`. Additionally, there are
+can always test them with `mx build && mx python`. Additionally, there are
 various "gates" that we use on our CI systems to check any code that goes
-in. You can run all of these using `mx python-gate` or just some by using `mx
+in. You can run all gates with `mx python-gate` or just some by using `mx
 python-gate --tags [TAG]`. Two interesting gates to run that cover most things
 are: