[Docs] Fix hf discussions info options that do not exist

[rishabhsai]

Summary

• docs/source/en/guides/cli.md documents --comments and --diff on hf discussions info, but neither exists. The command only takes --type/--repo-type and --token (src/huggingface_hub/cli/discussions.py:154), so copying either line straight out of the guide exits with code 2. docs/source/en/guides/community.md carried the same --comments example in its bash block.
• The --comments line was also wrong about the default. discussion_info prints the whole get_discussion_details object, so the conversation events are already in the output and there is nothing to opt into. The PR diff has its own subcommand, hf discussions diff, already documented a few sections down, so the guide now points there instead.
• --no-color is not a flag anywhere in the CLI either. Colour suppression reads the NO_COLOR environment variable (src/huggingface_hub/utils/_terminal.py:102, see https://no-color.org/), so that sentence now says NO_COLOR=1.

What the guide tells you to run today:

$ hf discussions info bigscience/bloom 2 --comments
Usage: hf discussions info [OPTIONS] REPO_ID NUM
Try 'hf discussions info --help' for help.

Error: No such option '--comments'.

Available options for 'hf discussions info':
  --type, --repo-type [model|dataset|space] The type of repository (model, dataset, or space).  [default: model]
  --token TEXT                   A User Access Token generated from https://huggingface.co/settings/tokens.
  -h, --help                     Show this message and exit.

$ hf discussions info username/my-model 5 --diff
Error: No such option '--diff'.

$ hf discussions ls bigscience/bloom --no-color
Error: No such option '--no-color'.

And the events are there without asking for them:

$ HF_TOKEN= hf discussions info bigscience/bloom 2 --format json
{"title": "Updates the BLOOM model card to sync with the updated https://github.com/bigscience-workshop/model_card", "status": "merged", "num": 2, "repo_id": "bigscience/bloom", "repo_type": "model", "author": "meg", "is_pull_request": true, "created_at": "2022-05-25T21:26:41+00:00", "endpoint": "https://huggingface.co", "events": [{"id": "628e9f119202a9acd20d4866", "type": "comment", "created_at": "2022-05-25T21:26:41+00:00", "author": "meg", ...}, {"id": "628e9f12bec8ba3575dbd338", "type": "commit", ...}, {"id": "628ea114312d910ef6f98a37", "type": "status-change", ...}], ...}

#3899 fixed a neighbouring batch of stale examples in the same two guides, so this is the same lane rather than a duplicate of it.

Checked with a script that parses every hf ... line in docs/source/en/**.md and validates it against the live click command tree: the discussions hits are gone, the 5 remaining hits are pre-existing false positives (shell pipes and flags inside quoted --container-args values). grep -n 'no-color\|--comments\|--diff' over both guides is empty, and make style (no regenerated file changed) then make quality are clean.

---

Note

Low Risk
Documentation-only changes; no runtime or API behavior is modified.

Overview
Updates the CLI and community guides so hf discussions info examples match the real command surface.

hf discussions info no longer documents nonexistent --comments or --diff flags. The text now states that metadata and conversation events are included by default, and directs readers to hf discussions diff for PR diffs. The community guide example drops --comments from the sample command.

Color suppression is documented as NO_COLOR=1 instead of a --no-color flag that the CLI does not expose.

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