update completion docs to reflect zmodules order

modules/completion/README.md

@@ -5,6 +5,8 @@ Enables and configures smart and extensive tab completion.
 
 Completions are sourced from [zsh-completions](https://github.com/zsh-users/zsh-completions).
 
+This should be the **LAST** module in the `zmodules` list in your `.zimrc`.
+
 Contributing
 ------------
 

templates/zimrc

@@ -9,8 +9,8 @@
 # select what modules you would like enabled
 # the second line of modules may depend on options set by modules in the first line
 # these dependencies are noted on the respective module's README.md
-zmodules=(completion directory environment git history input ssh utility \
-          syntax-highlighting history-substring-search prompt)
+zmodules=(directory environment git history input ssh utility \
+          syntax-highlighting history-substring-search prompt completion)
 
 
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