[css-text-4][editorial] Reorder dfns and fix wording

Author: fantasai

css-text-4/Overview.bs

@@ -10535,25 +10535,6 @@ Automatic Contextual Spacing: the 'text-autospace' property</h3>
 				text-autospace/text-autospace-mixed-001.html
 			</wpt>
 
-		<dt><dfn>insert</dfn>
-		<dd>
-			The specified spacing is automatically inserted
-			if there are no space characters of any kind ([=Unicode general category=] <code>Z</code>) already there.
-
-			If neither ''text-autospace/insert'' nor ''text-autospace/replace'' are specified,
-			the behavior is the same as ''text-autospace/insert''.
-
-		<dt><dfn>replace</dfn>
-		<dd>
-			The specified spacing is automatically inserted
-			even if there is already a [=space=] (U+0020) at that point;
-			additionally, the [=space=] (U+0020) is removed.
-			Other types of space characters ([=Unicode general category=] <code>Z</code>)
-			suppress automatic spacing, as for ''text-autospace/insert''.
-
-			Note: This is for correcting text which is using the easy-to-type U+0020
-			instead of proper spacing.
-
 		<dt><dfn>ideograph-alpha</dfn>
 		<dd>
 			Creates extra spacing between runs of
@@ -10580,6 +10561,26 @@ Automatic Contextual Spacing: the 'text-autospace' property</h3>
 			Otherwise this value has no effect.
 			However future specifications may add automatic spacing behavior for other languages.
 
+		<dt><dfn>insert</dfn>
+		<dd>
+			The specified spacing is automatically inserted
+			if there are no space characters of any kind ([=Unicode general category=] <code>Z</code>) already there.
+
+			This is the default behavior:
+			if neither ''text-autospace/insert'' nor ''text-autospace/replace'' are specified,
+			''text-autospace/insert'' is assumed.
+
+		<dt><dfn>replace</dfn>
+		<dd>
+			The specified spacing is automatically inserted
+			even if there is already a [=space=] (U+0020) at that point;
+			additionally, the [=space=] (U+0020) is removed.
+			Other types of space characters ([=Unicode general category=] <code>Z</code>)
+			suppress automatic spacing, as for ''text-autospace/insert''.
+
+			Note: This is for correcting text which is using the easy-to-type U+0020
+			instead of proper spacing.
+
 		<dt><dfn>auto</dfn>
 		<dd>
 			The user agent chooses a set of typographically high quality spacing values.