Docs: Improve "of" grammar

Author: johnlow95

doc/translation_process.md

@@ -62,7 +62,7 @@ token =
 username = USERNAME
 ```
 
-The Transifex Bitcoin project config file is included as part of the repo. It can be found at `.tx/config`, however you shouldn’t need change anything.
+The Transifex Bitcoin project config file is included as part of the repo. It can be found at `.tx/config`, however you shouldn’t need to change anything.
 
 ### Synchronising translations
 To assist in updating translations, we have created a script to help.