Update install guide for Rocky on SUSE

Update the supported SUSE versions in the preface, correct an invalid
doc link and fix a typo in the Rocky repository.

Change-Id: Ia82b0affb207436c6393f9d575dfa9503c97c32a

doc/install-guide/source/environment-networking.rst

@@ -19,7 +19,7 @@ distribution, see the documentation.
    * `SLES 12
      <https://www.suse.com/documentation/sles-12/book_sle_admin/data/sec_basicnet_manconf.html>`__
      or `openSUSE
-     <https://doc.opensuse.org/documentation/leap/reference/html/book.opensuse.reference/cha.basicnet.html>`__ Network Configuration
+     <https://doc.opensuse.org/documentation/leap/reference/html/book.opensuse.reference/cha.network.html>`__ Network Configuration
 
 All nodes require Internet access for administrative purposes such as package
 installation, security updates, :term:`DNS <Domain Name System (DNS)>`, and

doc/install-guide/source/environment-packages-obs.rst

@@ -62,7 +62,7 @@ Enable the OpenStack repository
 
   .. code-block:: console
 
-     # zypper addrepo -f obs://Cloud:OpenStack:Queens/SLE_12_SP4 Rocky
+     # zypper addrepo -f obs://Cloud:OpenStack:Rocky/SLE_12_SP4 Rocky
 
   **On SLES for OpenStack Queens:**
 

doc/install-guide/source/preface.rst

@@ -41,9 +41,9 @@ Currently, this guide describes OpenStack installation for the following
 Linux distributions:
 
 openSUSE and SUSE Linux Enterprise Server
-  You can install OpenStack by using packages on openSUSE Leap 42.3 and
-  SUSE Linux Enterprise Server 12 SP3 through the Open Build Service Cloud
-  repository.
+  You can install OpenStack by using packages on openSUSE Leap 42.3, openSUSE
+  Leap 15, and SUSE Linux Enterprise Server 12 SP4 through the Open Build
+  Service Cloud repository.
 
 Red Hat Enterprise Linux and CentOS
   You can install OpenStack by using packages available on Red Hat