remove dupe entries

(cherry picked from commit 18aa87803f)

changelogs/fragments/doc_fix.yml

@@ -0,0 +1,2 @@
+bugfixes:
+    - remove dupes from var precedence

docs/docsite/rst/user_guide/playbooks_variables.rst

@@ -835,12 +835,9 @@ Here is the order of precedence from least to greatest (the last listed variable
   * inventory group_vars/* [3]_
   * playbook group_vars/* [3]_
   * inventory file or script host vars [2]_
-  * inventory host_vars/*
-  * playbook host_vars/*
-  * host facts / cached set_facts [4]_
   * inventory host_vars/* [3]_
   * playbook host_vars/* [3]_
-  * host facts
+  * host facts / cached set_facts [4]_
   * play vars
   * play vars_prompt
   * play vars_files