Help page: Ctrl+U inconsistency

Help -> Keyboard shortcuts -> Bash shortcuts contains the following two lines:

Erase a line   Ctrl+U

Delete from the cursor to the beginning of the line   Ctrl+u

and also the following two:

Erase a word   Ctrl+W

Delete from the cursor to the start of the word   Ctrl+W

The first two, and the last two are effectively the same; once with a quickly readable name and once with a more technically correct description. I think we'd better keep only one of each.

Also, the use of lowercase u is inconsistent with the rest of the shortcuts; whichever description is kept should go with Ctrl+U with uppercase U.

(Subject to string freeze, so master only.)

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While at it, I'd personally remove the entire Bash shortcuts help section. gnome-terminal probably shouldn't aim to replicate parts of bash's documentation. Also, these shortcuts aren't needed at all for beginner users, simple line editing can always be preformed using the well-known Arrow and Backspace/Delete keys. Advanced users won't learn the advanced bash shortcuts from g-t's help. Slightly relevant: #7979 (closed). But maybe this is for another day...