[css-gcpm-4][editorial] Fix markup

Author: fantasai

css-gcpm-4/Overview.bs

@@ -36,7 +36,7 @@ also accept the <a>CSS-wide keywords</a> as their property value.
 For readability they have not been repeated explicitly.
 
 <h2 id="running-headers-and-footers">
-	Running headers and footers
+Running headers and footers
 </h2>
 [[CSS3PAGE]] describes the sixteen page margin boxes which can be used for running headers and footers, but does not describe a mechanism for inserting content in those boxes.
 
@@ -200,17 +200,17 @@ h2:last-of-page { copy-into: heading3 }
 The following figures show the first, start, and last assignments 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 <code>start</code> 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 <code>start</code> 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 <code>start</code> value is the exit value of the previous page.</figcaption>
 </figure>
 
@@ -253,7 +253,7 @@ The following figures show the first, start, and last assignments of the “head
 
 
 <h2 id="footnotes">
-	Footnotes
+Footnotes
 </h2>
 Ancillary content may be moved to the bottom or side of a page. A footnote is created when such content moves to the bottom of the page, leaving a reference indicator.
 
@@ -265,7 +265,7 @@ Footnotes are complex objects, so it will be helpful to define some terms before
 <figure>
 
 
-<img src="images/footnote-diagram.001.jpg" width="480" alt="page with footnotes"/>
+<img src="images/footnote-diagram.001.jpg" width="480" alt="page with footnotes">
 <figcaption>Footnote terminology</figcaption>
 </figure>