I've only just noticed this, and it seems rather odd. mIRC.chm documents /fseek as having the following switches.
-l <name> <line number>
-n <name> <next line>
-w <name> <wildcard>
-r <name> <regex>
Surely
<next line> is misleading, since <next line> is not a parameter, and the syntax to move the pointer to the next line is simply:
Hardly a major issue, but it is definitely misleading.