(Shell): Add `Shell Prompts' to menu.
(Shell Mode): Add xref to `Shell Prompts'. Clarify `C-c C-u' description. Delete remarks moved to new node. (Shell Prompts): New node. (History References): Replace remarks moved to `Shell Prompts' with xref to that node. (Remote Host): Clarify how to specify the terminal type when logging in to a different machine.
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