[css-writing-modes] Fix mixed up style rules in example, thanks to Cyril Concolato for reporting.

Author: fantasai

css-writing-modes-3/Overview.bs

@@ -504,8 +504,8 @@ Example of Bidirectional Text</h3>
 
     <pre>
 /* Rules for bidi */
-[dir=ltr] {direction: rtl; unicode-bidi: isolate; }
-[dir=rtl] {direction: ltr; unicode-bidi: isolate; }
+[dir=rtl] {direction: rtl; unicode-bidi: isolate; }
+[dir=ltr] {direction: ltr; unicode-bidi: isolate; }
 
 /* Rules for presentation */
 section, para  {display: block;}

css-writing-modes-4/Overview.bs

@@ -505,8 +505,8 @@ Example of Bidirectional Text</h3>
 
     <pre>
 /* Rules for bidi */
-[dir=ltr] {direction: rtl; unicode-bidi: isolate; }
-[dir=rtl] {direction: ltr; unicode-bidi: isolate; }
+[dir=rtl] {direction: rtl; unicode-bidi: isolate; }
+[dir=ltr] {direction: ltr; unicode-bidi: isolate; }
 
 /* Rules for presentation */
 section, para  {display: block;}