doc: fix typos in dhtnode manpage

doc/dhtnode.1

@@ -4,7 +4,7 @@
 .B dhtnode
 - a simple OpenDHT command line node runner.
 
-.SH SYNOPSYS
+.SH SYNOPSIS
 .B dhtnode [-h]
 
 .B dhtnode [-v [\fIlogfile\fP]] [-i] [-d] [-n \fInetwork_id\fP] [-p \fIlocal_port\fP] [-b [\fIbootstrap_host\fP[:\fIport\fP]]]
@@ -13,9 +13,9 @@
 
 This program runs a simple OpenDHT node in an interactive way. If you rather
 want to run the node in daemon mode, option \fB'-d'\fP is provided. When running
-in the interractive shell, you benefit from the readline capabilites for writing
+in the interactive shell, you benefit from the readline capabilities for writing
 your commands such as command history. Here are the available commands in the
-interractive shell:
+interactive shell:
 
 .EE
     h, help    Print this help message.
@@ -46,7 +46,7 @@ Prints some help.
 
 .TP
 \fB-v\fP \fIlogfile\fP
-Enable the verbose mode. Optionaly provide a log file.
+Enable the verbose mode. Optionally provide a log file.
 
 .TP
 \fB-i\fP
@@ -59,7 +59,7 @@ Run the program in daemon mode (will fork in the background).
 .TP
 \fB-n\fP \fInetwork_id\fP
 Specify the network id. This let you connect to distinct networks and prevents
-the merge of two diffrent networks (available since OpenDHT v0.6.1).
+the merge of two different networks (available since OpenDHT v0.6.1).
 
 .TP
 \fB-p\fP \fIlocal_port\fP