minor #15052 [Cache] Remove compression option from Redis and Memcache (Nyholm)

This PR was squashed before being merged into the 4.4 branch.

Discussion
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[Cache] Remove `compression` option from Redis and Memcache

This option was removed in 4.4 because it didn't work.

See symfony/symfony#34133

This will fix #15050

Commits
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b11322c [Cache] Remove `compression` option from Redis and Memcache

Author: javiereguiluz

components/cache/adapters/memcached_adapter.rst

@@ -124,7 +124,6 @@ option names and their respective values::
 
         // associative array of configuration options
         [
-            'compression' => true,
             'libketama_compatible' => true,
             'serializer' => 'igbinary',
         ]
@@ -143,17 +142,6 @@ Available Options
     server(s). Any action that retrieves data, quits the connection, or closes
     down the connection will cause the buffer to be committed.
 
-``compression`` (type: ``bool``, default: ``true``)
-    Enables or disables payload compression, where item values longer than 100
-    bytes are compressed during storage and decompressed during retrieval.
-
-``compression_type`` (type: ``string``)
-    Specifies the compression method used on value payloads. when the
-    **compression** option is enabled.
-
-    Valid option values include ``fastlz`` and ``zlib``, with a default value
-    that *varies based on flags used at compilation*.
-
 ``connect_timeout`` (type: ``int``, default: ``1000``)
     Specifies the timeout (in milliseconds) of socket connection operations when
     the ``no_block`` option is enabled.

components/cache/adapters/redis_adapter.rst

@@ -131,7 +131,6 @@ array of ``key => value`` pairs representing option names and their respective v
 
         // associative array of configuration options
         [
-            'compression' => true,
             'lazy' => false,
             'persistent' => 0,
             'persistent_id' => null,
@@ -151,10 +150,6 @@ Available Options
     If none is specified, it will return ``\Redis`` if the ``redis`` extension is
     available, and ``\Predis\Client`` otherwise.
 
-``compression`` (type: ``bool``, default: ``true``)
-    Enables or disables compression of items. This requires phpredis v4 or higher with
-    LZF support enabled.
-
 ``lazy`` (type: ``bool``, default: ``false``)
     Enables or disables lazy connections to the backend. It's ``false`` by
     default when using this as a stand-alone component and ``true`` by default