Moved precompute to top now that it's the default

Invalidation.rst

@@ -49,12 +49,30 @@ data. Old values can be reused, new values set, or the cache can even be
 refreshed before it gets stale. Different methods can be set by passing the
 appropriate constant to Stash's "get" function.
 
+
+Precompute
+----------
+
+The personal favorite method of the Stash developers, this method causes Stash
+to recalculate the cached item _before_ it misses.
+
+When this method is used Stash->get takes one additional argument, the amount of
+time (in seconds) before the expiration when it should regenerate the cache.
+
+.. code-block:: php
+
+    <?php
+    // five minutes before the cache expires one instance will return a miss,
+    // causing the cache to regenerate.
+    $item->get(Item::SP_PRECOMPUTE, 300);
+
+
 None
 ----
 
 By default Stash simply returns true for the "isMiss" function whenever the
 cache is invalid, meaning multiple cache misses can occur at once and stampede
-protection is not enabled. While not needed, this method can be explicitly set.
+protection is not enabled.
 
 .. code-block:: php
 
@@ -69,22 +87,6 @@ protection is not enabled. While not needed, this method can be explicitly set.
     // returns false if the item is missing or expired, no exceptions.
     $item->isMiss();
 
-Precompute
-----------
-
-The personal favorite method of the Stash developers, this method causes Stash
-to recalculate the cached item _before_ it misses.
-
-When this method is used Stash->get takes one additional argument, the amount of
-time (in seconds) before the expiration when it should regenerate the cache.
-
-.. code-block:: php
-
-    <?php
-    // five minutes before the cache expires one instance will return a miss,
-    // causing the cache to regenerate.
-    $item->get(Item::SP_PRECOMPUTE, 300);
-
 Old
 ---