fix: replace Unicode arrows with ASCII in workflow comments

Author: emjay0921

.github/workflows/build_deploy_multiversion.yml

@@ -1,8 +1,8 @@
 name: Build and deploy multi-version OpenSPP documentation
 
 # This workflow builds and deploys multi-version documentation:
-# - v2.0 (latest) from v2-odoo19-doc-refresh branch → root (/)
-# - v1.3 from stable branch → /v1.3/
+# - v2.0 (latest) from v2-odoo19-doc-refresh branch -> root (/)
+# - v1.3 from stable branch -> /v1.3/
 
 on:
   push: