chore(docs): remove excess indentation from code blocks

dgeni-packages 0.10.0-rc.5 has a fix for this problem, so this commit updates
to that version.
Adds a new e2e test to prove this is fixed.

Closes #8963

docs/app/e2e/api-docs/api-pages.scenario.js

@@ -37,5 +37,15 @@ describe("doc.angularjs.org", function() {
       var code = element.all(by.css('tt')).first();
       expect(code.getText()).toContain('guest!!!');
     });
+
+    it("should trim indentation from code blocks", function() {
+      browser.get('index-debug.html#!/api/ng/type/$rootScope.Scope');
+
+      var codeBlocks = element.all(by.css('pre > code.lang-js'));
+      codeBlocks.each(function(codeBlock) {
+        var firstSpan = codeBlock.all(by.css('span')).first();
+        expect(firstSpan.getText()).not.toMatch(/^\W+$/);
+      });
+    });
   });
 });