Switch to round brackets

Author: frankieroberto

app/guide/using-markdown.md

@@ -118,7 +118,7 @@ The content within the square brackets is used for alternative text (alt text) f
 
 The alt text should contain the key information within the image that is being discussed in your post. For example, if the image is a screenshot, the alt text could describe the visual layout of the page, or could contain the key content in the screenshot. It should not be generic text like "Screenshot of homepage".
 
-Within the rounded brackets you must include the exact name of the image file, which is case sensitive.
+Within the round brackets you must include the exact name of the image file, which is case sensitive.
 
 ```md
 We redesigned the homepage to clearly list the different services within our portfolio: