Small grammar update

Author: dobooth

src/guides/v2.3/frontend-dev-guide/tools/using_grunt.md

@@ -77,9 +77,9 @@ Where the following notation is used:
 -  `<language>`: specified in the `code_subtag` format, for example `en_US`. Only one locale can be specified here. To debug the theme with another locale, create one more theme declaration, having specified another value for `language`.
 -  `<path_to_file>`: path to the root source file, relative to the `app/design/frontend/<Vendor>/<theme>/web` directory. You need to specify all [root source files of the theme]({{ page.baseurl }}/frontend-dev-guide/css-topics/css-preprocess.html#css_preprocess_terms). If your theme [inherits] from a certain theme, and does not contain its own root source files, specify the root source files of the parent theme.
 
-Once these all are set right you can run grunt to watch your changes.
+Once these are set correctly, run grunt to watch your changes.
 
--  Run `grunt exec:<theme>` from the root directory to republish the symlinks
+-  Run `grunt exec:<theme>` from the root directory to republish the symlinks.
 -  Run `grunt watch:<theme>`, so that grunt will watch for each and every changes you make.
 
 ## Using custom Grunt configuration files