also mention GCC version in 'Current situation' subsection of toolchain support policy

Author: boegel

docs/policies/toolchains.md

@@ -20,11 +20,10 @@ exceptions, but we aim to keep these limited.)
 Sites and users can then supplement these easyconfigs via there own collection of easyconfigs. This additional
 collection is added via the [robot search path][robot_search_path].
 
-## Example
+## Current situation
 
 As of July 2023 (EasyBuild 4.8.0) the latest toolchain generation is `2023a`.
 
 * Supported: 2023a, 2022b, 2022a, 2021b, 2021a, 2020b
-* Deprecated: 2020a, 2019b
-* Archived (and unsupported): 2019a and older
-
+* Deprecated: 2020a (GCC 9.3.0), 2019b (GCC 8.3.0)
+* Archived (and unsupported): 2019a (GCC 8.2.0), and older