Manual: Add missing reference to "ftp" as possible fetch method.
Manual: Add missing reference to "ftp" as possible fetch method.

Signed-off-by: Robert P. J. Day <01aa5cd9a29907856ec6ddeebcb643ede4c45b8b@crashcourse.ca>
Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

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