Configure XMS: example update

[Martin-Zeithaml]

Describe your pull request here:

The example is mixing NAME and MEM.
The change in example is related to the name only, not suffix.

List the file(s) included in this PR:

docs/user-guide/configure-xmem-server.md (#4150)
docs/user-guide/api-mediation/using-api-mediation-layer.md (#4151)

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