Update documentation.yml

(cherry picked from commit 54c384581cd0ed395d4f314dfdaca14dc70acf4c)

Author: stephencelis

.github/workflows/documentation.yml

@@ -58,7 +58,7 @@ jobs:
           rm -rf docs-out/.git;
           rm -rf docs-out/main;
           rm -rf docs-out/protocol-beta;
-          git tag -l --sort=-v:refname | grep -e "\d\+\.\d\+.0" | tail -n +10 | xargs -I {} rm -rf docs-out/{};
+          git tag -l --sort=-v:refname | grep -e "\d\+\.\d\+.0" | tail -n +6 | xargs -I {} rm -rf docs-out/{};
 
           for tag in $(echo "main"; echo "protocol-beta"; git tag -l --sort=-v:refname | grep -e "\d\+\.\d\+.0" | head -6);
           do