documentation: Modify cases of "[a-zA-Z] e\.g\.," for readability.

docs/development/using.md

@@ -13,7 +13,7 @@ the development environment][authentication-dev-server].
 ## Common
 
 - Zulip's `main` branch moves quickly, and you should rebase
-  constantly with e.g.,
+  constantly with, for example,
   `git fetch upstream; git rebase upstream/main` to avoid developing
   on an old version of the Zulip codebase (leading to unnecessary
   merge conflicts).