Improve documentation for method chaining. [ci skip]

lodash.js

@@ -1365,13 +1365,18 @@
     /*------------------------------------------------------------------------*/
 
     /**
-     * Creates a `lodash` object which wraps `value` to enable implicit chaining.
+     * Creates a `lodash` object which wraps `value` to enable implicit method
-     * Methods that operate on and return arrays, collections, and functions can
+     * chaining. Methods that operate on and return arrays, collections, and
-     * be chained together. Methods that retrieve a single value or may return a
+     * functions can be chained together. Methods that retrieve a single value or
-     * primitive value will automatically end the chain returning the unwrapped
+     * may return a primitive value will automatically end the chain sequence and
-     * value. Explicit chaining may be enabled using `_.chain`. The execution of
+     * return the unwrapped value. Otherwise, the value must be unwrapped with
-     * chained methods is lazy, that is, execution is deferred until `_#value`
+     * `_#value`.
-     * is implicitly or explicitly called.
+     *
+     * Explicit chaining, which requires unwrapping with `_#value` in all cases,
+     * may be enabled using `_.chain`.
+     *
+     * The execution of chained methods is lazy, that is, execution is deferred
+     * until `_#value` is implicitly or explicitly called.
      *
      * Lazy evaluation allows several methods to support shortcut fusion. Shortcut
      * fusion is an optimization strategy which merge iteratee calls; this can help
@@ -5751,8 +5756,8 @@
     /*------------------------------------------------------------------------*/
 
     /**
-     * Creates a `lodash` object that wraps `value` with explicit method
+     * Creates a `lodash` object that wraps `value` with explicit method chaining enabled.
-     * chaining enabled.
+     * The result of such method chaining must be unwrapped with `_#value`.
      *
      * @static
      * @memberOf _