[CHORE] Updated API code documentation

Author: Renemari Padillo

www/branch.js

@@ -274,6 +274,8 @@ Branch.prototype.createBranchUniversalObject = function (options) {
              *    |  feature  |   String   |   The link feature    |
              *    |   alias   |   String   |    The link alias     |
              *    |  channel  |   String   |   The link channel    |
+             *    | campaign  |   String   |   The campaign that   |
+             *    |           |            |  the link belongs to  |
              *    |   stage   |   String   |    The link stage     |
              *    |  duration |    Int     |   The link duration   |
              *    --------------------------------------------------
@@ -313,6 +315,8 @@ Branch.prototype.createBranchUniversalObject = function (options) {
              *    |  feature  |   String   |   The link feature    |
              *    |   alias   |   String   |    The link alias     |
              *    |  channel  |   String   |   The link channel    |
+             *    | campaign  |   String   |   The campaign that   |
+             *    |           |            |  the link belongs to  |
              *    |   stage   |   String   |    The link stage     |
              *    |  duration |    Int     |   The link duration   |
              *    --------------------------------------------------