doc: Update os-recommendations.rst to remove empty rows

- Removing rows in tables without any supported versions


Signed-off-by: Joseph Mundackal <[email protected]>

Author: jmundack

doc/start/os-recommendations.rst

@@ -53,8 +53,6 @@ non-Linux systems but these are not supported by the core Ceph effort.
 +===============+================+===============+==================+==================+==================+
 | Centos 7      |                |               |                  |                  |      B           |
 +---------------+----------------+---------------+------------------+------------------+------------------+
-| Centos 8      |                |               |                  |                  |                  |
-+---------------+----------------+---------------+------------------+------------------+------------------+
 | Centos 9      | A              |    A          |     A :sup:`1`   |                  |                  |
 +---------------+----------------+---------------+------------------+------------------+------------------+
 | Debian 10     |                |    C          |                  |         C        |      C           |
@@ -90,24 +88,8 @@ This table shows the operating systems that support Ceph's official container im
 +---------------+----------------+------------------+------------------+
 |               | Squid (19.2.z) | Reef (18.2.z)    | Quincy (17.2.z)  |
 +===============+================+==================+==================+
-| Centos 7      |                |                  |                  |
-+---------------+----------------+------------------+------------------+
-| Centos 8      |                |                  |                  |
-+---------------+----------------+------------------+------------------+
 | Centos 9      |      H         |        H         |        H         |
 +---------------+----------------+------------------+------------------+
-| Debian 10     |                |                  |                  |
-+---------------+----------------+------------------+------------------+
-| Debian 11     |                |                  |                  |
-+---------------+----------------+------------------+------------------+
-| OpenSUSE 15.2 |                |                  |                  |
-+---------------+----------------+------------------+------------------+
-| OpenSUSE 15.3 |                |                  |                  |
-+---------------+----------------+------------------+------------------+
-| Ubuntu 18.04  |                |                  |                  |
-+---------------+----------------+------------------+------------------+
-| Ubuntu 20.04  |                |                  |                  |
-+---------------+----------------+------------------+------------------+
 | Ubuntu 22.04  |      H         |        H         |                  |
 +---------------+----------------+------------------+------------------+