Fix typo, OPTOINS -> OPTIONS (#1087)

Found via `typos --format brief`

man/ttyd.1

@@ -83,7 +83,7 @@ Cross platform: macOS, Linux, FreeBSD/OpenBSD, OpenWrt/LEDE, Windows
 
 .PP
 -t, --client-option 
-      Send option to client (format: key=value), repeat to add more options, see \fBCLIENT OPTOINS\fP for details
+      Send option to client (format: key=value), repeat to add more options, see \fBCLIENT OPTIONS\fP for details
 
 .PP
 -T, --terminal-type
@@ -150,7 +150,7 @@ Cross platform: macOS, Linux, FreeBSD/OpenBSD, OpenWrt/LEDE, Windows
       Print this text and exit
 
 
-.SH CLIENT OPTOINS
+.SH CLIENT OPTIONS
 .PP
 ttyd has a mechanism to pass server side command-line arguments to the browser page which is called \fBclient options\fP:
 

man/ttyd.man.md

@@ -54,7 +54,7 @@ ttyd 1 "September 2016" ttyd "User Manual"
       Do not allow clients to write to the TTY
 
   -t, --client-option <key=value>
-      Send option to client (format: key=value), repeat to add more options, see **CLIENT OPTOINS** for details
+      Send option to client (format: key=value), repeat to add more options, see **CLIENT OPTIONS** for details
 
   -T, --terminal-type
       Terminal type to report, default: xterm-256color
@@ -104,7 +104,7 @@ ttyd 1 "September 2016" ttyd "User Manual"
   -h, --help
       Print this text and exit
 
-# CLIENT OPTOINS
+# CLIENT OPTIONS
 ttyd has a mechanism to pass server side command-line arguments to the browser page which is called **client options**:
 
 ```bash