refactor(ci): change vimdoc PR title and commit message

Author: s1n7ax

.github/workflows/docs.yml

@@ -27,3 +27,5 @@ jobs:
         uses: peter-evans/create-pull-request@v5
         with:
           base: "main"
+          commit-message: "chore(doc): automatic vimdoc update"
+          title: Auto vimdoc update