Fix: Fix typo in help for <Leader>fb

[T Hawk]

repo url: https://github.com/thawk/SpaceVim.git
branch: fix_doc_for_leader_f_b

When typing <leader>f, there's a typo for <leader>fb

[Eric Wong]

Thanks, Merged. :)

--------------

Eric Wong

>repo url: https://github.com/thawk/SpaceVim.git

>branch: fix_doc_for_leader_f_b

>

>When typing <leader>f, there's a typo for <leader>fb

>

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