refactor($compile): change parameter name

The boundTransclusionFn that is passed in is really the one from the
parent node.  The change to parentBoundTranscludeFn clarifies this compared
to the childBoundTranscludeFn.

src/ng/compile.js

@@ -935,7 +935,7 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
       // return a linking function if we have found anything, null otherwise
       return linkFnFound ? compositeLinkFn : null;
 
-      function compositeLinkFn(scope, nodeList, $rootElement, boundTranscludeFn) {
+      function compositeLinkFn(scope, nodeList, $rootElement, parentBoundTranscludeFn) {
         var nodeLinkFn, childLinkFn, node, $node, childScope, i, ii, n, childBoundTranscludeFn;
 
         // copy nodeList so that linking doesn't break due to live list updates.
@@ -962,17 +962,17 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
             // We need to create a new boundTranscludeFn if
             //  - a directive on this element wants to transclude
             //  or
-            //  - there is no boundTranscludeFn already and a transcludeFn was passed in
-            if ( nodeLinkFn.transcludeOnThisElement || (!boundTranscludeFn && transcludeFn) ) {
+            //  - there is no parentBoundTranscludeFn already and a transcludeFn was passed in
+            if ( nodeLinkFn.transcludeOnThisElement || (!parentBoundTranscludeFn && transcludeFn) ) {
               childBoundTranscludeFn = createBoundTranscludeFn(scope, nodeLinkFn.transclude || transcludeFn);
             } else {
-              childBoundTranscludeFn = boundTranscludeFn;
+              childBoundTranscludeFn = parentBoundTranscludeFn;
             }
 
             nodeLinkFn(childLinkFn, childScope, node, $rootElement, childBoundTranscludeFn);
 
           } else if (childLinkFn) {
-            childLinkFn(scope, node.childNodes, undefined, boundTranscludeFn);
+            childLinkFn(scope, node.childNodes, undefined, parentBoundTranscludeFn);
           }
         }
       }