docs/Community_Github.md: fix small spelling error

Author: leggewie

docs/Community_Github.md

@@ -29,7 +29,7 @@ Armbian OS assembly line:
 
 Armbian OS community assembly line:
 
-- [weekly rolling releases](https://github.com/armbian/community/releases) for build targets without a dedicated mainteiner.
+- [weekly rolling releases](https://github.com/armbian/community/releases) for build targets without a dedicated maintainer.
 
 ## Armbian Distribution
 <https://github.com/armbian/distribution>