Fix function doc to match that of C POPEN
It may be misleading to some user to believe it is taking a path to a
file, when it is executing an arbitrary shell command for the first argument.
@@ -777,7 +777,7 @@ static const JanetReg io_cfuns[] = {
#ifndef JANET_NO_PROCESSES
{
"file/popen", cfun_io_popen,
- JDOC("(file/popen path &opt mode)\n\n"
+ JDOC("(file/popen command &opt mode)\n\n"
"Open a file that is backed by a process. The file must be opened in either "
"the :r (read) or the :w (write) mode. In :r mode, the stdout of the "
"process can be read from the file. In :w mode, the stdin of the process "
