added text formatting

Author: ajburnle

articles/active-directory/fundamentals/customize-branding.md

@@ -60,6 +60,18 @@ Your custom branding won't immediately appear when your users go to sites such a
 
         - **Sign-in page text.** Type the text that appears on the bottom of the sign-in page. You can use this text to communicate additional information, such as the phone number to your help desk or a legal statement. This text must be Unicode and not exceed 256 characters. We also suggest not including links or HTML tags.
 
+        - **Sign-in page text formatting (Preview).** You can format text to include bold, italics, an underline or clickable link. Use the following syntax to add formatting to text: 
+
+            > Hyperlink: ```[text](link)``` 
+
+            > Bold: ``` **text** ``` or ``` __text__ ``` 
+
+            > Italics: ``` *text* ``` or ``` _text_ ``` 
+
+            > Underline: ``` ++text++ ``` 
+
+            In addition to formatting text, you can also begin a new paragraph by using the enter key twice.
+
     - **Advanced settings**
 
         ![Configure company branding page, with advanced settings completed](media/customize-branding/configure-company-branding-advanced-settings.png)