[docs] Serial comma

The serial comma (also called the Oxford comma) is the last comma before coordinating conjunction and the final item in a series. Its use is considered a matter of style and is cause for much debate. Many style guides require the serial comma, and a few advise against it. There are times when it must be used to avoid confusion or ambiguity. For the sake of consistency, we recommend always using the serial comma.
mui · Aug 22, 2020 · e9f428b · e9f428b
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diff --git a/docs/src/pages/guides/localization/localization.md b/docs/src/pages/guides/localization/localization.md
@@ -78,5 +78,5 @@ However, Material-UI aims to support the [100 most popular locales](https://en.w
 
 ## RTL Support
 
-Right-to-left languages such as Arabic, Persian or Hebrew are supported.
+Right-to-left languages such as Arabic, Persian, or Hebrew are supported.
 Follow [this guide](/guides/right-to-left/) to use them.
diff --git a/docs/src/pages/guides/right-to-left/right-to-left.md b/docs/src/pages/guides/right-to-left/right-to-left.md
@@ -1,6 +1,6 @@
 # Right-to-left
 
-<p class="description">Right-to-left languages such as Arabic, Persian or Hebrew are supported. To change the direction of Material-UI components you must follow the following steps.</p>
+<p class="description">Right-to-left languages such as Arabic, Persian, or Hebrew are supported. To change the direction of Material-UI components you must follow the following steps.</p>
 
 ## Steps