Remove dots from the wiki_app password

May raise an issue due to uncommon characters.

Guides/wiki.md

@@ -27,7 +27,7 @@ Do not use wiki in url filepath.
 ```
 sudo -u postgres psql
 
-CREATE USER wiki_app WITH NOCREATEDB NOCREATEROLE NOSUPERUSER ENCRYPTED PASSWORD '52w7maa..';
+CREATE USER wiki_app WITH NOCREATEDB NOCREATEROLE NOSUPERUSER ENCRYPTED PASSWORD '52w7maa';
 
 CREATE DATABASE wiki_db WITH OWNER wiki_app;
 ```