bcache: doc: update Documentation/admin-guide/bcache.rst

bcache.rst is from the original bcache.txt which was merged in mainline
kernel v3.10. There are a few things changed in the past 7 years. This
patch updates bache.rst documents in following content,
- Update bcache-tools git repo to,
  https://git.kernel.org/pub/scm/linux/kernel/git/colyli/bcache-tools.git/
- Update bcache kernel tree to mainline kernel tree,
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
- make-bcache util is replaced by the unified bcache util,
  `make-bcache` now can be performed by `bcache make`

Signed-off-by: Coly Li <colyli@suse.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kent Overstreet <kent.overstreet@gmail.com>
Link: https://lore.kernel.org/r/20200821151354.16727-1-colyli@suse.de
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

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