[css-content-3] Fix markup.

Author: fantasai

css-content-3/Overview.bs

@@ -372,7 +372,7 @@ Element Content</h3>
 	It is also not a parse error to use it on a ''::marker'' pseudo-element,
 	it is only during the rendering stage that it gets treated like ''content/none''.
 
- 	Issue: Do we need the statement about marker pseudo-elements here? Or is this legacy from the old version of the spec?
+	Issue: Do we need the statement about marker pseudo-elements here? Or is this legacy from the old version of the spec?
 
 
 <h3 id="quotes">
@@ -753,12 +753,12 @@ Procedure for rendering leaders</h4>
 	Issue: Leaders don't quite work in table layouts. How can we fix this?
 
 	<figure>
-		<img src="images/leader.001.jpg" width="480" alt="drawing leaders"/>
+		<img src="images/leader.001.jpg" width="480" alt="drawing leaders">
 		<figcaption>Procedure for drawing leaders</figcaption>
 	</figure>
 
 	<figure>
-		<img src="images/leader.002.jpg" width="480" alt="drawing leaders"/>
+		<img src="images/leader.002.jpg" width="480" alt="drawing leaders">
 		<figcaption>Procedure for drawing leaders when the content doesn’t fit on a single line</figcaption>
 	</figure>
 
@@ -1090,19 +1090,19 @@ The ''string()'' function</h4>
 		of the “heading” string on various pages.
 
 		<figure>
-			<img src="images/using-strings-1.jpg" width="480" alt=""/>
+			<img src="images/using-strings-1.jpg" width="480" alt="">
 			<figcaption>The ''string-set/start'' value is empty,
 			as the string had not yet been set at the start of the page.</figcaption>
 		</figure>
 
 		<figure>
-			<img src="images/using-strings-2.jpg" width="480" alt=""/>
+			<img src="images/using-strings-2.jpg" width="480" alt="">
 			<figcaption>Since the page starts with an h2,
 			the ''string-set/start'' value is the value of that head.</figcaption>
 		</figure>
 
 		<figure>
-			<img src="images/using-strings-3.jpg" width="480" alt=""/>
+			<img src="images/using-strings-3.jpg" width="480" alt="">
 			<figcaption>Since there’s not an h2 at the top of this page,
 			the ''string-set/start'' value is the <a>exit value</a> of the previous page.</figcaption>
 		</figure>