Fix comma (#2818)

content/roadmaps/100-frontend/content/101-html/101-writing-semantic-html.md

@@ -1,6 +1,6 @@
 # Semantic HTML
 
-Semantic element clearly describes its meaning to both the browser and the developer. In HTML,semantic element are the type of elements that can be used to define different parts of a web page such as `<form>`, `<table>`, `<article>`, `<header>`, `<footer>`, etc.
+Semantic element clearly describes its meaning to both the browser and the developer. In HTML, semantic element are the type of elements that can be used to define different parts of a web page such as `<form>`, `<table>`, `<article>`, `<header>`, `<footer>`, etc.
 
 <ResourceGroupTitle>Free Content</ResourceGroupTitle>
 <BadgeLink badgeText='Read' colorScheme='yellow' href='https://developer.mozilla.org/en-US/docs/Glossary/Semantics'>Semantics - MDN Web Docs Glossary: Definitions of Web-related terms | MDN</BadgeLink>
@@ -9,4 +9,3 @@ Semantic element clearly describes its meaning to both the browser and the devel
 <BadgeLink badgeText='Read' colorScheme='yellow' href='https://www.freecodecamp.org/news/html-best-practices/'>HTML Best Practices – How to Build a Better HTML-Based Website</BadgeLink>
 <BadgeLink badgeText='Read' colorScheme='yellow' href='https://blog.hubspot.com/website/semantic-html'>Semantic HTML: What It Is and How It Improves Your Site</BadgeLink>
 <BadgeLink badgeText='Read' colorScheme='yellow' href='https://hackernoon.com/how-to-write-semantic-html-dkq3ulo'>How To Write Semantic HTML</BadgeLink>
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