input: forward: fix plugin type

Signed-off-by: Eduardo Silva <eduardo@treasure-data.com>

Author: edsiper

pipeline/inputs/forward.md

@@ -1,6 +1,6 @@
 # Forward
 
-_Forward_ is the protocol used by [Fluentd](http://www.fluentd.org) to route messages between peers. The **forward** output plugin allows to provide interoperability between [Fluent Bit](http://fluentbit.io) and [Fluentd](http://fluentd.org). There are not configuration steps required besides to specify where [Fluentd](http://fluentd.org) is located, it can be in the local host or a in a remote machine.
+_Forward_ is the protocol used by [Fluentd](http://www.fluentd.org) to route messages between peers. The **forward** input plugin allows to provide interoperability between [Fluent Bit](http://fluentbit.io) and [Fluentd](http://fluentd.org). There are not configuration steps required besides to specify where [Fluentd](http://fluentd.org) is located, it can be in the local host or a in a remote machine.
 
 This plugin offers two different transports and modes: