res_pjsip: Add XML documentation for "use_callerid_contact"

ASTERISK-28087

Change-Id: I69d48813ec514f5ef06c6de994cba52630e0a3b4

res/res_pjsip.c

@@ -1828,6 +1828,13 @@
 						at the first semicolon.</para></note>
 					</description>
 				</configOption>
+				<configOption name="use_callerid_contact" default="no">
+					<synopsis>Place caller-id information into Contact header</synopsis>
+					<description><para>
+						This option will cause Asterisk to place caller-id information into
+						generated Contact headers.</para>
+					</description>
+				</configOption>
 			</configObject>
 		</configFile>
 	</configInfo>