Update 10.6.md

Author: katarzyna-koltun-mx

content/en/docs/releasenotes/studio-pro/10/10.6.md

@@ -12,7 +12,7 @@ This is the [MTS](/releasenotes/studio-pro/lts-mts/#mts) version 10 release for
 
 ## 10.6.21 {#10621}
 
-**Release date: February ___, 2024**
+**Release date: February 6, 2024**
 
 {{% button color="info" href="https://marketplace.mendix.com/link/studiopro/10.6.21" text="Go to Marketplace" title="Download version 10.6.21 from the Marketplace" %}}