Issue #1327484 by nmudgal: Fix a couple of docs headers in Book module

core/modules/book/book.module

@@ -414,7 +414,7 @@ function book_get_books() {
 }
 
 /**
- * Implements hook_form_BASE_FORM_ID_alter().
+ * Implements hook_form_BASE_FORM_ID_alter() for node_form().
  *
  * Adds the book fieldset to the node form.
  *
@@ -1036,7 +1036,7 @@ function _book_parent_depth_limit($book_link) {
 }
 
 /**
- * Implements hook_form_FORM_ID_alter().
+ * Implements hook_form_FORM_ID_alter() for node_delete_confirm().
  *
  * Alters the confirm form for a single node deletion.
  *

core/modules/book/book.pages.inc

@@ -56,7 +56,7 @@ function book_export($type, $nid) {
 }
 
 /**
- * This function is called by book_export() to generate HTML for export.
+ * Generates HTML for export when invoked by book_export().
  *
  * The given node is embedded to its absolute depth in a top level section. For
  * example, a child node with depth 2 in the hierarchy is contained in