Update 10.3.md

typographical errors and improved readability

Author: Jimmy99

en/10.3.md

@@ -43,7 +43,7 @@ We've just described how to automatically load custom language packs. In fact, t
 
 	//Load the default configuration files, which are placed below in `go-i18n/locales`
 
-	//File should be named zh.json, en-json, en-US.json etc., so we can be continuously support more languages
+	//File should be named zh.json, en-json, en-US.json etc., so we can continuously support more languages
 
 	func (il *IL) loadDefaultTranslations(dirPath string) error {
 		dir, err := os.Open(dirPath)