[doc] Update code docs

lib/nconf/provider.js

@@ -7,6 +7,12 @@
 
 var stores = require('./stores');
 
+//
+// ### function Provider (options)
+// #### @options {Object} Options for this instance.
+// Constructor function for the Provider object responsible
+// for exposing the pluggable storage features of `nconf`.
+//
 var Provider = exports.Provider = function (options) {
   options = options || {};
   this.store = stores.create(options.type || 'memory', options);
@@ -46,6 +52,18 @@ Provider.prototype.set = function (key, value, callback) {
   return this.store.set(key, value, callback);
 };
 
+//
+// ### function merge (key, value)
+// #### @key {string} Key to merge the value into
+// #### @value {literal|Object} Value to merge into the key
+// Merges the properties in `value` into the existing object value
+// at `key`. If the existing value `key` is not an Object, it will be
+// completely overwritten.
+//
+Provider.prototype.merge = function (key, value, callback) {
+  return this.store.merge(key, value, callback);
+}
+
 //
 // ### function clear (key, callback)
 // #### @key {string} Key to remove from this instance

lib/nconf/stores/memory.js

@@ -112,6 +112,14 @@ Memory.prototype.clear = function (key) {
   return true;
 };
 
+//
+// ### function merge (key, value)
+// #### @key {string} Key to merge the value into
+// #### @value {literal|Object} Value to merge into the key
+// Merges the properties in `value` into the existing object value
+// at `key`. If the existing value `key` is not an Object, it will be
+// completely overwritten.
+//
 Memory.prototype.merge = function (key, value) {
   //
   // If the key is not an `Object` or is an `Array`,

lib/nconf/stores/redis.js

@@ -162,6 +162,15 @@ Redis.prototype.set = function (key, value, callback) {
   });
 };
 
+//
+// ### function merge (key, value, callback)
+// #### @key {string} Key to merge the value into
+// #### @value {literal|Object} Value to merge into the key
+// #### 2callback {function} Continuation to respond to when complete.
+// Merges the properties in `value` into the existing object value
+// at `key`. If the existing value `key` is not an Object, it will be
+// completely overwritten.
+//
 Redis.prototype.merge = function (key, value, callback) {
   //
   // If the key is not an `Object` or is an `Array`,
@@ -358,6 +367,12 @@ Redis.prototype.reset = function (callback) {
   });
 };
 
+//
+// ### @private function _addKeys (key, callback) 
+// #### @key {string} Key to add parent keys for
+// #### @callback {function} Continuation to respond to when complete.
+// Adds the full `key` path to Redis via `sadd`.
+//
 Redis.prototype._addKeys = function (key, callback) {
   var self = this,
       path = nconf.path(key);