Minor documentation typo fixes

docs/content/documentation/getting-started/cli-usage.md

@@ -36,7 +36,7 @@ $ gutenberg build --base-url $DEPLOY_URL
 This is useful for example when you want to deploy previews of a site to a dynamic URL, such as Netlify
 deploy previews.
 
-+You can override the default output directory 'public' by passing a other value to the `output-dir` flag.
+You can override the default output directory 'public' by passing a other value to the `output-dir` flag.
 
 ```bash
 $ gutenberg build --output-dir $DOCUMENT_ROOT

docs/content/documentation/themes/installing-and-using-themes.md

@@ -40,7 +40,7 @@ templates/macros.html -> replace themes/simple-blog/templates/macros.html
 static/js/site.js -> replace themes/simple-blog/static/js/site.js
 ```
 
-You can also choose to only parts of a page if a theme define some blocks by extending it. If we wanted
+You can also choose to only override parts of a page if a theme define some blocks by extending it. If we wanted
 to only change a single block from the `post.html` page in the example above, we could do the following:
 
 ```