chore: instructions for running forks

[skip ci]
diff --git a/.github/workflows/server-tests-mariadb.yml b/.github/workflows/server-tests-mariadb.yml
index bbb8a7e..c70c76f 100644
--- a/.github/workflows/server-tests-mariadb.yml
+++ b/.github/workflows/server-tests-mariadb.yml
@@ -16,12 +16,12 @@
   workflow_dispatch:
     inputs:
       user:
-        description: 'user'
+        description: 'Frappe Framework repository user (add your username for forks)'
         required: true
         default: 'frappe'
         type: string
       branch:
-        description: 'Branch name'
+        description: 'Frappe Framework branch'
         default: 'develop'
         required: false
         type: string