Fix typos

text/0014-xul-overlay-removal-review-packet.md

@@ -20,7 +20,7 @@ All of the C++ code that supports the complex logic of loading and merging overl
 XUL Maintainers (Neil Deakin, Gijs Kruitbosch), Firefox Frontend (Dave Townsend)
 
 ## Brief
-A detailed review of XUL overlay usage shows some common patterns and gives insight into how they can be removed. In general, the uses fall into four categories: unused, used once, used multiple times for simple templating, and used multiple times in a more complicated manor.
+A detailed review of XUL overlay usage shows some common patterns and gives insight into how they can be removed. In general, the uses fall into four categories: unused, used once, used multiple times for simple templating, and used multiple times in a more complicated manner.
 
 ### Unused