Misleading text at start of manual

[Reuben Thomas]

(Checked against bash 4.2; for some reason, the manual on gnu.org is only 4.1.)

The top node, "Bash Features", says:

"The following menu breaks the features up into categories based upon which
one of these other shells inspired the feature."

But the following menu doesn't seem to bear that out. Perhaps it's
simplest just to remove this sentence, as the top-level menu is
perfectly logical and self-explanatory.

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