Update testing-patches.mdx (#366)

Author: logan-keller

src/content/docs/code-push/guides/testing-patches.mdx

@@ -17,7 +17,7 @@ https://pub.dev/documentation/shorebird_code_push/latest/shorebird_code_push/Upd
 We have plans to
 [allow additional track names in the future](https://github.com/shorebirdtech/updater/issues/255).
 
-Typically we se customers use "staging" for internal testing (on developers'
+Typically we see customers use "staging" for internal testing (on developers'
 machines) and "beta" for wider group testing (e.g. QA teams where `shorebird`
 commands are not available).