remove slice docs (#37946)

docs/docsite/rst/user_guide/playbooks_filters.rst

@@ -955,17 +955,6 @@ To make use of one attribute from each item in a list of complex variables, use
     # get a comma-separated list of the mount points (e.g. "/,/mnt/stuff") on a host
     {{ ansible_mounts|map(attribute='mount')|join(',') }}
 
-.. versionadded:: 2.5
-
-The `slice` filter can be used to extract the values of specific keys from a
-hash::
-
-    {{ {'x': 1, 'y': 2, 'z': 3 } | slice(['x', 'z']) }}
-
-This will result in::
-
-    [1, 2]
-
 To get date object from string use the `to_datetime` filter, (new in version in 2.2)::
 
     # Get total amount of seconds between two dates. Default date format is %Y-%m-%d %H:%M:%S but you can pass your own format