update mend workflow, exclude commits to docs

Signed-off-by: Jakub Jarosz <j.jarosz@f5.com>

Author: jjngx

.github/workflows/mend.yml

@@ -5,18 +5,16 @@ on:
     branches:
       - main
       - release-*
-      - v3
     tags:
       - "v[0-9]+.[0-9]+.[0-9]+*"
     paths-ignore:
-      - examples/**
+      - docs/**
   pull_request:
     branches:
       - main
       - release-*
-      - v3
     paths-ignore:
-      - examples/**
+      - docs/**
 
 concurrency:
   group: ${{ github.ref_name }}-mend