[CLI] ADoc nav generation raising an KeyError exception

Traceback (most recent call last):

  File "/home/james/Projects/couchbase-build/couchbase-cli/docs/generate.py", line 259, in <module>

    main()

  File "/home/james/Projects/couchbase-build/couchbase-cli/docs/generate.py", line 253, in main

    generate_navs(args.verbose)

  File "/home/james/Projects/couchbase-build/couchbase-cli/docs/generate.py", line 239, in generate_navs

    generate(fn, verbose)

  File "/home/james/Projects/couchbase-build/couchbase-cli/docs/generate.py", line 222, in generate

    generated += fn(module)

  File "/home/james/Projects/couchbase-build/couchbase-cli/docs/generate.py", line 237, in fn

    return Generator(module=module).generate_navs()

  File "/home/james/Projects/couchbase-build/couchbase-cli/docs/generate.py", line 156, in generate_navs

    return [self._generate_nav(command, subcommands[command.meta.command],

  File "/home/james/Projects/couchbase-build/couchbase-cli/docs/generate.py", line 157, in <listcomp>

    subsubcommands[adoc.meta.command]) for command in commands]

KeyError: 'cbrestore'