Typo fix.

kpinnipa · web-flow · commit 14cecdcba7d4 · 2021-01-27T13:18:04.000-08:00
diff --git a/docs/contributor/codebase.rst b/docs/contributor/codebase.rst
@@ -24,7 +24,7 @@ This contains test scripts that test our codebase using jest.
 
 Design: ``design/``
 ^^^^^^^^^^^^^^^^^^^
-A directory contains gifs or images that show the design perspective of
+This directory contains gifs or images that show the design perspective of
 our extension.
 
 Style: ``style/``
