mention new targets are tier 3.md

Author: ChrisDenton

posts/2024-02-15-Windows-7.md

@@ -8,7 +8,7 @@ The minimum requirements for tier 1 toolchains targeting Windows will increase w
 Windows 10 will now be the minimum supported version.
 These requirements apply both to running the Rust compiler itself and to running binaries produced by Rust, if they use the libstd.
 
-Additionally there are two new targets that have Windows 7 as their baseline: `x86_64-win7-windows-msvc` and `i686-win7-windows-msvc`.
+Additionally there are two new tier 3 targets that have Windows 7 as their baseline: `x86_64-win7-windows-msvc` and `i686-win7-windows-msvc`.
 
 ## Affected targets