Unify help messages in neofs-cli

[fyrchik]

We should reread all our messages and unify them.
Currently some of the parameters start with a capital letter, some a don't. Let's always use a capital letter.

Put object to NeoFS

Usage:
  neofs-cli object put [flags]

Flags:
      --address string        address of wallet account
      --attributes string     User attributes in form of Key1=Value1,Key2=Value2
      --bearer string         File with signed JSON or binary encoded bearer token
      --cid string            Container ID
      --disable-filename      Do not set well-known filename attribute
      --disable-timestamp     Do not set well-known timestamp attribute
  -e, --expire-at uint        Last epoch in the life of the object
      --file string           File with object payload
  -g, --generate-key          generate new private key
  -h, --help                  help for put
      --no-progress           Do not show progress bar
      --notify string         Object notification in the form of *epoch*:*topic*; '-' topic means using default
  -r, --rpc-endpoint string   remote node address (as 'multiaddr' or '<host>:<port>')
      --session string        path to a JSON-encoded container session token
      --ttl uint32            TTL value in request meta header (default 2)
  -w, --wallet string         path to the wallet or binary key
  -x, --xhdr strings          Request X-Headers in form of Key=Value