✨ feat(help): add help texts

[jfbus]

Description

This PR adds help texts on commands and flags:

gli oapi -h
Send commands to the Outscale API.

Usage:
  gli oapi [command]

NetPeering
  AcceptNetPeering                     Accepts a Net peering request.
  CreateNetPeering                     Requests a Net peering between a Net you own and a peer Net that belongs to you or another account.
  DeleteNetPeering                     Deletes a Net peering.
  ReadNetPeerings                      Lists one or more peering connections between two Nets.
  RejectNetPeering                     Rejects a Net peering request.
[...]

gli oapi AcceptNetPeering -h
Accepts a Net peering request.

To accept this request, you must be the owner of the peer Net. If you do not accept the request within 7 days, the state of the Net peering becomes expired.

**[NOTE]**

A peering connection between two Nets works both ways. Therefore, when an A-to-B peering connection is accepted, any pending B-to-A peering connection is automatically rejected as redundant.

Usage:
  gli oapi AcceptNetPeering [flags]

Flags:
      --DryRun                If true, checks whether you have the required permissions to perform the action.
      --NetPeeringId string   The ID of the Net peering you want to accept.
  -h, --help                  help for AcceptNetPeering

Global Flags:
      --jq string   jq-like output filter
  -v, --verbose     Verbose output

Type of Change

Please check the relevant option(s):

• 🐛 Bug fix
• ✨ New feature
• 🧹 Code cleanup or refactor
• 📝 Documentation update
• 🔧 Build or CI-related change
• 🔒 Security fix
• Other (specify):

How Has This Been Tested?

Please describe the test strategy:

• Manual testing
• Unit tests
• Integration tests
• Not tested yet

Checklist

• I have followed the Contributing Guidelines
• I have added tests or explained why they are not needed
• I have updated relevant documentation (README, examples, etc.)
• My changes follow the Conventional Commits specification
• My commits include appropriate Gitmoji

Additional Context