[#3926] Add Changelog entry

diff --git a/changelog_unreleased/3926-the-shared-network-name-property-in-subnetx-list-is-not-documented b/changelog_unreleased/3926-the-shared-network-name-property-in-subnetx-list-is-not-documented
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+++ b/changelog_unreleased/3926-the-shared-network-name-property-in-subnetx-list-is-not-documented
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+[doc]          slawek
+       Described a new shared network name parameter of the subnetX-list
+       commands in ARM.
+       (Gitlab #3926)