doc: fix version number for DEP006

Author: aduh95

doc/api/deprecations.md

@@ -173,7 +173,7 @@ changes:
     description: A deprecation code has been assigned.
   - version: v0.11.14
     description: Runtime deprecation.
-  - version: v0.5.11
+  - version: v0.5.10
     description: Documentation-only deprecation.
 -->