Add complete output for usage section of each CLI command

[pjsharath28]

Each bbolt CLI command usage section in the docs needs to have the complete output.

Example:

$bbolt surgery clear-page-elements -h
Clears elements from the given page, which can be a branch or leaf page

Usage:
  bbolt surgery clear-page-elements <bbolt-file> [flags]

Flags:
      --from-index int   start element index (included) to clear, starting from 0
  -h, --help             help for clear-page-elements
      --output string    path to the filePath db file
      --pageId uint      page id
      --to-index int     end element index (excluded) to clear, starting from 0, -1 means to the end of page

cc: @ahrtr

[pjsharath28]

/assign

[Elbehery]

Is this already done by #1131 ?