fix(Files): mention enabledPreviewProviders parameter in Previews cha…

…pter

Signed-off-by: Josh Richards <[email protected]>

admin_manual/configuration_files/previews_configuration.rst

@@ -16,12 +16,13 @@ By default, Nextcloud can generate previews for the following filetypes:
 * Cover of MP3 files
 * Text documents
 
-.. note:: Technically Nextcloud can also generate the previews
-          of other file types such as PDF, SVG or various office documents.
-          Due to security concerns those providers have been disabled by
-          default and are considered unsupported.
-          While those providers are still available, we discourage enabling 
-          them, and they are not documented.
+.. note:: Nextcloud can also generate previews of other file types (such as PDF, SVG,
+   various Office document formats, and various video formats). Due to security and
+   performance concerns those providers are disabled by default. While those providers 
+   are still available, we discourage enabling them and they are considered unsupported. 
+   The full list of the preview providers that are enabled by default (as well as those 
+   disabled by default) can be found under the ``enabledPreviewProviders`` 
+   :doc:`configuration parameter </configuration_server/config_sample_php_parameters>`.
 
 Parameters
 ----------