improve wording: “closing body tag”

packages/@uppy/core/src/Plugin.js

@@ -136,7 +136,7 @@ module.exports = class Plugin {
     this.uppy.log(`Not installing ${callerPluginName}`)
     throw new Error(`Invalid target option given to ${callerPluginName}. Please make sure that the element 
       exists on the page, or that the plugin you are targeting has been installed. Check that the <script> tag initializing Uppy 
-      comes at the bottom of the page, before the </body> (see https://github.com/transloadit/uppy/issues/1042).`)
+      comes at the bottom of the page, before the closing </body> tag (see https://github.com/transloadit/uppy/issues/1042).`)
   }
 
   render (state) {