docs: Fix MySQL create database syntax (#10436)

Signed-off-by: Ask Bjørn Hansen <ask@develooper.com>

docs/content/doc/installation/database-preparation.en-us.md

@@ -52,7 +52,7 @@ Note: All steps below requires that the database engine of your choice is instal
 3.  Create database with UTF-8 charset and collation. Make sure to use `utf8mb4` charset instead of `utf8` as the former supports all Unicode characters (including emojis) beyond *Basic Multilingual Plane*. Also, collation chosen depending on your expected content. When in doubt, use either `unicode_ci` or `general_ci`.
 
     ```sql
-    CREATE DATABASE 'giteadb' CHARACTER SET 'utf8mb4' COLLATE 'utf8mb4_unicode_ci';
+    CREATE DATABASE giteadb CHARACTER SET 'utf8mb4' COLLATE 'utf8mb4_unicode_ci';
     ```
 
     Replace database name as appropriate.