Don;t log deprecation warning for own logic

lib/api/decodePage.js

@@ -1,3 +1,4 @@
+var deprecate = require('./deprecate');
 
 /**
     Decode changes from a JS API to a page object.
@@ -17,22 +18,26 @@ function decodePage(output, page, result) {
         return page;
     }
 
+    deprecate.disable('page.sections');
+
     // GitBook 3
     // Use returned page.content if different from original content
     if (result.content != originalContent) {
-        return page.set('content', result.content);
+        page = page.set('content', result.content);
     }
 
     // GitBook 2 compatibility
     // Finally, use page.sections
-    if (result.sections) {
-        return page.set('content',
+    else if (result.sections) {
+        page = page.set('content',
             result.sections.map(function(section) {
                 return section.content;
             }).join('\n')
         );
     }
 
+    deprecate.enable('page.sections');
+
     return page;
 }