[Rd] Error read.table()'s help page and put the distinction between (PR#14109)

[pengyu.ut at gmail.com]

The word 'be' is missing after 'will' in the following sentence from
?read.table.

"Note that in either case the columns will logical unless =91colClasses=92
was supplied."

Another suggestion:

I think that it is make more sense to put at the begining the
description of the difference between the methods listed in on the
help page of read.table.

Currently, the document put the description of the arguments at the
beginning. But a new user would first want to figure out which method
to use before knowing what the arguments are.