[mediaqueries] Lift <media-feature> parens to <media-in-parens> (#6806) (#10131)

Author: cdoublev

mediaqueries-4/Overview.bs

@@ -445,7 +445,6 @@ Media Features</h3>
 	or in range form with a comparison operator.
 
 	<pre class='railroad'>
-	T: (
 	Choice:
 		And:
 			N: feature name
@@ -455,7 +454,6 @@ Media Features</h3>
 		And:
 			N: range form
 			C: (see below)
-	T: )
 	</pre>
 
 	There are, however, several important differences between properties and media features:

mediaqueries-5/Overview.bs

@@ -446,7 +446,6 @@ Media Features</h3>
 	or in range form with a comparison operator.
 
 	<pre class='railroad'>
-	T: (
 	Choice:
 		And:
 			N: feature name
@@ -456,7 +455,6 @@ Media Features</h3>
 		And:
 			N: range form
 			C: (see below)
-	T: )
 	</pre>
 
 	There are, however, several important differences between properties and media features:
@@ -897,9 +895,9 @@ Syntax</h2>
 	<dfn>&lt;media-not></dfn> = not <<media-in-parens>>
 	<dfn>&lt;media-and></dfn> = and <<media-in-parens>>
 	<dfn>&lt;media-or></dfn> = or <<media-in-parens>>
-	<dfn>&lt;media-in-parens></dfn> = ( <<media-condition>> ) | <<media-feature>> | <<general-enclosed>>
+	<dfn>&lt;media-in-parens></dfn> = ( <<media-condition>> ) | ( <<media-feature>> ) | <<general-enclosed>>
 
-	<dfn>&lt;media-feature></dfn> = ( [ <<mf-plain>> | <<mf-boolean>> | <<mf-range>> ] )
+	<dfn>&lt;media-feature></dfn> = [ <<mf-plain>> | <<mf-boolean>> | <<mf-range>> ]
 	<dfn>&lt;mf-plain></dfn> = <<mf-name>> : <<mf-value>>
 	<dfn>&lt;mf-boolean></dfn> = <<mf-name>>
 	<dfn>&lt;mf-range></dfn> = <<mf-name>> <<mf-comparison>> <<mf-value>>