[css-align] Fix syntactic position of <overflow-position> and <self-position> etc. Fixes #1001.

Author: fantasai

css-align/Overview.bs

@@ -614,7 +614,7 @@ Content Distribution: the 'align-content' and 'justify-content' properties and '
 
 	<pre class="propdef">
 	Name: align-content
-	Value: normal | <<baseline-position>> |  <<content-distribution>> | [ <<overflow-position>>? && <<content-position>> ]
+	Value: normal | <<baseline-position>> |  <<content-distribution>> | [ <<overflow-position>>? <<content-position>> ]
 	Initial: normal
 	Applies to: block containers, flex containers, and grid containers
 	Inherited: no
@@ -626,7 +626,7 @@ Content Distribution: the 'align-content' and 'justify-content' properties and '
 
 	<pre class="propdef">
 	Name: justify-content
-	Value: normal | <<content-distribution>> | [ <<overflow-position>>? && <<content-position>> ]
+	Value: normal | <<content-distribution>> | [ <<overflow-position>>? <<content-position>> ]
 	Initial: normal
 	Applies to: block containers, flex containers, and grid containers
 	Inherited: no
@@ -1125,7 +1125,7 @@ Block/Cross-Axis Alignment: the 'align-self' property</h3>
 
 	<pre class="propdef">
 	Name: align-self
-	Value: auto | normal | stretch | <<baseline-position>> | [ <<overflow-position>>? && <<self-position>> ]
+	Value: auto | normal | stretch | <<baseline-position>> | [ <<overflow-position>>? <<self-position>> ]
 	Initial: auto
 	Applies to: flex items, grid items, and absolutely-positioned boxes
 	Inherited: no
@@ -1167,7 +1167,7 @@ Block/Cross-Axis Alignment: the 'align-self' property</h3>
 			[[#baseline-align-self]],
 			and [[#baseline-rules]].
 
-		: <<overflow-position>>? && <<self-position>>
+		: <<overflow-position>>? <<self-position>>
 		::
 			Defined in [[#alignment-values]], above.
 	</dl>
@@ -1392,7 +1392,7 @@ Inline/Main-Axis Alignment: the 'justify-items' property</h3>
 
 	<pre class="propdef">
 	Name: justify-items
-	Value: auto | normal | stretch | <<baseline-position>> | [ <<overflow-position>>? && <<self-position>> ] | [ legacy && [ ''<content-position>/left'' | ''<content-position>/right'' | ''<content-position>/center'' ] ]
+	Value: auto | normal | stretch | <<baseline-position>> | [ <<overflow-position>>? <<self-position>> ] | [ legacy && [ ''<content-position>/left'' | ''<content-position>/right'' | ''<content-position>/center'' ] ]
 	Initial: auto
 	Applies to: all elements
 	Inherited: no
@@ -1444,7 +1444,7 @@ Block/Cross-Axis Alignment: the 'align-items' property</h3>
 
 	<pre class="propdef">
 	Name: align-items
-	Value: normal | stretch | <<baseline-position>> | [ <<overflow-position>>? && <<self-position>> ]
+	Value: normal | stretch | <<baseline-position>> | [ <<overflow-position>>? <<self-position>> ]
 	Initial: normal
 	Applies to: all elements
 	Inherited: no
@@ -1703,6 +1703,8 @@ Changes</h2>
 			(<a href="https://github.com/w3c/csswg-drafts/issues/1184">Issue 1184</a>)
 		<li>Deferred ability to specify fallback alignments to Level 4.
 			(<a href="https://github.com/w3c/csswg-drafts/issues/1002#issuecomment-295143297">Issue 1002</a>)
+		<li>Fixed position of <<overflow-position>> wrt <<content-position>>.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/1001">Issue 1001</a>)
 	</ul>
 
 <h2 id="privacy-security">