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doc/Factoids.md: clarity

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@ -304,7 +304,7 @@ You can use the following variables in a factoid or, in some cases, as an argume
`$arg[n]` expands to the nth argument. Indexing begins from 0 (the first argument is `$arg[0]`). You may use a negative number to count from the end; e.g., `$arg[-2]` means the 2nd argument from the end. Multiple words can be double-quoted to constitute one argument. If the argument does not exist, the variable and the leading space before it will be silently removed.
### $arg[n:m]
`$arg[n:m]` expands to a slice of arguments between `n` and `m`. Indexing begins from 0 (the first argument is `$arg[0]`). Not specifying the `m` value means the rest of the arguments; e.g., `$arg[2:]` means the remaining arguments after the first two. Multiple words can be double-quoted to constitute one argument. If the argument does not exist, the variable and the leading space before it will be silently removed.
`$arg[n:m]` expands to a slice of arguments between `n` and `m`. Indexing begins from 0 (the first argument is `$arg[0]`). Omitting the `m` value will use up the arguments after the `n`th value; e.g., `$arg[2:]` means the remaining arguments after the first two. Multiple words can be double-quoted to constitute one argument. If the argument does not exist, the variable and the leading space before it will be silently removed.
### $arglen
`$arglen` expands to the number of arguments provided to a factoid.