Update 4.0.0 to 4.0-beta1 at Documentation/Installing

Patch by Ekaterina Dimitrova, reviewed by brandonwilliams for CASSANDRA-16000

doc/source/getting_started/installing.rst

@@ -77,7 +77,7 @@ Installing the binary tarball
 
 ::
 
-   $ curl -OL http://apache.mirror.digitalpacific.com.au/cassandra/4.0.0/apache-cassandra-4.0.0-bin.tar.gz
+   $ curl -OL http://apache.mirror.digitalpacific.com.au/cassandra/4.0-beta1/apache-cassandra-4.0-beta1-bin.tar.gz
 
 NOTE: The mirrors only host the latest versions of each major supported release. To download an earlier
 version of Cassandra, visit the `Apache Archives <http://archive.apache.org/dist/cassandra/>`__.
@@ -87,24 +87,24 @@ version of Cassandra, visit the `Apache Archives <http://archive.apache.org/dist
 
 ::
 
-   $ gpg --print-md SHA256 apache-cassandra-4.0.0-bin.tar.gz 
-   apache-cassandra-4.0.0-bin.tar.gz: 28757DDE 589F7041 0F9A6A95 C39EE7E6
+   $ gpg --print-md SHA256 apache-cassandra-4.0-beta1-bin.tar.gz
+   apache-cassandra-4.0-beta1-bin.tar.gz: 28757DDE 589F7041 0F9A6A95 C39EE7E6
                                       CDE63440 E2B06B91 AE6B2006 14FA364D
 
 Compare the signature with the SHA256 file from the Downloads site:
 
 ::
 
-   $ curl -L https://downloads.apache.org/cassandra/4.0.0/apache-cassandra-4.0.0-bin.tar.gz.sha256
+   $ curl -L https://downloads.apache.org/cassandra/4.0-beta1/apache-cassandra-4.0-beta1-bin.tar.gz.sha256
    28757dde589f70410f9a6a95c39ee7e6cde63440e2b06b91ae6b200614fa364d
 
 4. Unpack the tarball:
 
 ::
 
-   $ tar xzvf apache-cassandra-4.0.0-bin.tar.gz
+   $ tar xzvf apache-cassandra-4.0-beta1-bin.tar.gz
 
-The files will be extracted to the ``apache-cassandra-4.0.0/`` directory. This is the tarball installation
+The files will be extracted to the ``apache-cassandra-4.0-beta1/`` directory. This is the tarball installation
 location.
 
 5. Located in the tarball installation location are the directories for the scripts, binaries, utilities, configuration, data and log files:
@@ -130,7 +130,7 @@ For information on how to configure your installation, see
 
 ::
 
-   $ cd apache-cassandra-4.0.0/
+   $ cd apache-cassandra-4.0-beta1/
    $ bin/cassandra
 
 NOTE: This will run Cassandra as the authenticated Linux user.