Drop mention of specific Ruby versions (en)

Author: stomar

en/documentation/installation/index.md

@@ -74,9 +74,6 @@ You can use it like this:
 $ sudo apt-get install ruby-full
 {% endhighlight %}
 
-As of writing, the `ruby-full` package provides Ruby 2.3.1, which is an old
-stable release, on Debian and Ubuntu.
-
 
 ### yum (CentOS, Fedora, or RHEL)
 {: #yum}
@@ -101,8 +98,6 @@ Gentoo uses the portage package manager.
 $ sudo emerge dev-lang/ruby
 {% endhighlight %}
 
-By default, this will try to install versions 1.9 and 2.0,
-but more versions are available.
 To install a specific version, set `RUBY_TARGETS` in your `make.conf`.
 See the [Gentoo Ruby Project website][gentoo-ruby] for details.