[DOCS] Update CCS compatibility matrix for 8.3 (#88906)

* [DOCS] Update CCS compatibility matrix for 8.3

Updates the CCS compatibility table to include 8.3.

* Fixing busted table :hammer:

* Update table for 8.3 -> 8.1 support

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

docs/reference/search/search-your-data/ccs-version-compat-matrix.asciidoc

@@ -1,12 +1,13 @@
-[cols="^,^,^,^,^,^,^"]
+[cols="^,^,^,^,^,^,^,^"]
 |====
-| 6+^h| Remote cluster version
+| 7+^h| Remote cluster version
 h| Local cluster version
-                  |  6.8        | 7.1–7.16   | 7.17       | 8.0        | 8.1        | 8.2
-| 6.8             |  {yes-icon} | {yes-icon} | {yes-icon} | {no-icon}  | {no-icon}  | {no-icon}
-| 7.1–7.16        |  {yes-icon} | {yes-icon} | {yes-icon} | {no-icon}  | {no-icon}  | {no-icon}
-| 7.17            |  {yes-icon} | {yes-icon} | {yes-icon} | {yes-icon} | {yes-icon} | {yes-icon}
-| 8.0             |  {no-icon}  | {no-icon}  | {yes-icon} | {yes-icon} | {yes-icon} | {yes-icon}
-| 8.1             |  {no-icon}  | {no-icon}  | {no-icon}  | {yes-icon} | {yes-icon} | {yes-icon}
-| 8.2             |  {no-icon}  | {no-icon}  | {no-icon}  | {no-icon}  | {yes-icon} | {yes-icon}
-|====
+            |  6.8        | 7.1–7.16   | 7.17       | 8.0        | 8.1        | 8.2        | 8.3
+| 6.8       |  {yes-icon} | {yes-icon} | {yes-icon} | {no-icon}  | {no-icon}  | {no-icon}  | {no-icon}
+| 7.1–7.16  |  {yes-icon} | {yes-icon} | {yes-icon} | {no-icon}  | {no-icon}  | {no-icon}  | {no-icon}
+| 7.17      |  {yes-icon} | {yes-icon} | {yes-icon} | {yes-icon} | {yes-icon} | {yes-icon} | {yes-icon}
+| 8.0       |  {no-icon}  | {no-icon}  | {yes-icon} | {yes-icon} | {yes-icon} | {yes-icon} | {yes-icon}
+| 8.1       |  {no-icon}  | {no-icon}  | {no-icon}  | {yes-icon} | {yes-icon} | {yes-icon} | {yes-icon}
+| 8.2       |  {no-icon}  | {no-icon}  | {no-icon}  | {no-icon}  | {yes-icon} | {yes-icon} | {yes-icon}
+| 8.3       |  {no-icon}  | {no-icon}  | {no-icon}  | {no-icon}  | {no-icon} | {yes-icon} | {yes-icon}
+|====