[ci skip] 3.1.9 release

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diff --git a/user_guide_src/source/general/caching.rst b/user_guide_src/source/general/caching.rst
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-################
-Web Page Caching
-################
-
-CodeIgniter lets you cache your pages in order to achieve maximum
-performance.
-
-Although CodeIgniter is quite fast, the amount of dynamic information
-you display in your pages will correlate directly to the server
-resources, memory, and processing cycles utilized, which affect your
-page load speeds. By caching your pages, since they are saved in their
-fully rendered state, you can achieve performance that nears that of
-static web pages.
-
-How Does Caching Work?
-======================
-
-Caching can be enabled on a per-page basis, and you can set the length
-of time that a page should remain cached before being refreshed. When a
-page is loaded for the first time, the cache file will be written to
-your application/cache folder. On subsequent page loads the cache file
-will be retrieved and sent to the requesting user's browser. If it has
-expired, it will be deleted and refreshed before being sent to the
-browser.
-
-.. note: The Benchmark tag is not cached so you can still view your page
-	load speed when caching is enabled.
-
-Enabling Caching
-================
-
-To enable caching, put the following tag in any of your controller
-methods::
-
-	$this->output->cache($n);
-
-Where ``$n`` is the number of **minutes** you wish the page to remain
-cached between refreshes.
-
-The above tag can go anywhere within a method. It is not affected by
-the order that it appears, so place it wherever it seems most logical to
-you. Once the tag is in place, your pages will begin being cached.
-
-.. important:: Because of the way CodeIgniter stores content for output,
-	caching will only work if you are generating display for your
-	controller with a :doc:`view <./views>`.
-
-.. important:: If you change configuration options that might affect
-	your output, you have to manually delete your cache files.
-
-.. note:: Before the cache files can be written you must set the file
-	permissions on your *application/cache/* directory such that
-	it is writable.
-
-Deleting Caches
-===============
-
-If you no longer wish to cache a file you can remove the caching tag and
-it will no longer be refreshed when it expires.
-
-.. note:: Removing the tag will not delete the cache immediately. It will
-	have to expire normally.
-
-If you need to manually delete the cache, you can use the ``delete_cache()``
-method::
-
-	// Deletes cache for the currently requested URI
-	$this->output->delete_cache();
-
-	// Deletes cache for /foo/bar
-	$this->output->delete_cache('/foo/bar');
\ No newline at end of file