DOC-13627 Remove all mentions of memcached bucket from docs

Change-Id: I3b2080a490460f063b5473a9f7bdc5f8f1b79cdc
Reviewed-on: https://review.couchbase.org/c/couchbase-cli/+/235368
Tested-by: Lubo Marinski <lubo.marinski@couchbase.com>
Well-Formed: Restriction Checker
Reviewed-by: Lubo Marinski <lubo.marinski@couchbase.com>

Author: safianalicb

docs/modules/cli/pages/cbcli/couchbase-cli-bucket-flush.adoc

@@ -20,7 +20,7 @@ _couchbase-cli bucket-flush_ [--cluster <url>] [--username <user>] [--password <
 
 Deletes all data from a bucket. The bucket itself is not deleted; and all
 its indexes and configuration-details remain unchanged. Applies to
-Couchbase, Ephemeral, and Memcached buckets.
+Couchbase and Ephemeral buckets.
 
 == OPTIONS
 

docs/modules/cli/pages/cbcli/couchbase-cli-bucket-list.adoc

@@ -50,13 +50,6 @@ $ couchbase-cli bucket-list -c 192.168.1.5:8091 --username Administrator \
    ramQuota: 268435456
    ramUsed: 1134432
    vBuckets: 1024
- flight-data
-   bucketType: memcached
-   numReplicas: 0
-   ramQuota: 104857600
-   ramUsed: 0
-   vBuckets: 1024
-----
 == DISCUSSION
 
 In the output, RAM figures are in bytes. The "membase" bucketType signifies a