local.conf.sample: Add a note about ASSUME_PROVIDED for help2man

Similar, but opposite of oe.dev example.

Signed-off-by: Tom Rini <tom_rini@mentor.com>

meta-yocto/conf/local.conf.sample

@@ -213,7 +213,9 @@ NO32LIBS = "1"
 #TERMCMD = "${KONSOLE_TERMCMD}"
 #TERMCMDRUN = "${KONSOLE_TERMCMDRUN}"
 
-
 # The network based PR service host and port
 #PRSERV_HOST = "localhost"
 #PRSERV_PORT = "8585"
+
+# Uncomment this if your host distribution provides the help2man tool.
+#ASSUME_PROVIDED += "help2man-native"