Update content-style-guide.md

contributing/content-style-guide.md

@@ -128,7 +128,7 @@ To orient readers and help them understand if the section is relevant to them, i
 
 ### Alt text
 
-Every image must include an alt attribute that provides a complete description of the image for the user. For more information, see “[Accessibility guidelines for images and videos](https://review.docs.microsoft.com/en-us/help/contribute/contribute-accessibility-multimedia)” in the Microsoft Docs Contributor Guide.
+Every image must include an alt attribute that provides a complete description of the image for the user. For more information, see “[Accessibility guidelines for images and videos](https://review.docs.microsoft.com/en-us/help/contribute/contribute-accessibility-multimedia)” in the Microsoft Docs Contributor Guide. Note that you'll need to be logged on to your Microsoft account to be able access the link.
 
 ### Filenames