The Local channel has never supported app_transfer
from what I can see so remove it from the documentation.
ASTERISK-25649
Change-Id: Icbcfe297f6f866285a26b3e9fd5c6d00fa22e0e9
</syntax>
<description>
<para>Requests the remote caller be transferred
- to a given destination. If TECH (SIP, IAX2, LOCAL etc) is used, only
+ to a given destination. If TECH (SIP, IAX2, etc) is used, only
an incoming call with the same channel technology will be transferred.
Note that for SIP, if you transfer before call is setup, a 302 redirect
SIP message will be returned to the caller.</para>