[css-text-4] Remove the explicit normal value for text-spacing

Addition of 'normal' to text-spacing-trim means that it is no longer
necessary to define it in the shorthand explicitely. Just using the
longhand values in the shorthand will already give the same effect.

Part of #9511

css-text-4/Overview.bs

@@ -10990,7 +10990,7 @@ Character Class Spacing Shorthand: the 'text-spacing' property</h3>
 
 	<pre class="propdef shorthand">
 	Name: text-spacing
-	Value: normal | none | auto | <<spacing-trim>> || <<autospace>>
+	Value: none | auto | <<spacing-trim>> || <<autospace>>
 	Initial: see individual properties
 	Applies to: text
 	Inherited: yes
@@ -11010,12 +11010,6 @@ Character Class Spacing Shorthand: the 'text-spacing' property</h3>
 	Values are defined as follows:
 
 	<dl dfn-for=text-spacing dfn-type=value>
-		<dt><dfn>normal</dfn>
-		<dd>
-			Specifies the baseline behavior,
-			setting each [=sub-property=] to its [=initial value=].
-			Equivalent to ''space-first ideograph-alpha ideograph-numeric''.
-
 		<dt><dfn>none</dfn>
 		<dd>
 			Turns off all text-spacing features:
@@ -11039,6 +11033,8 @@ Character Class Spacing Shorthand: the 'text-spacing' property</h3>
 			'text-spacing-trim' is set to its [=initial value=].
 	</dl>
 
+	Note: As ''text-spacing-trim/normal'' is the initial value of both 'text-spacing-trim' and 'text-autospace',
+	''text-spacing: normal'' resets both to their initial values.
 
 <h3 id="boundary-shaping">
 Shaping Across Element Boundaries</h3>