docs(#2671): trim per-verb arg help (diff, list, lint, pr-merge)

Continue trimming clap arg help to user-relevant info: drop the
token-bounded-paging rationale (list --page), the why-it's-required
note (lint no-reviewer), the `Forgejo Do:`/`force_merge` API internals
(pr-merge), and tighten diff --full. pr-status was already clean.

hive-forge/src/verbs/pr_merge.rs

@@ -24,9 +24,9 @@ use crate::client::{Client, index, split_repo};
 /// per-commit history, so a squash option isn't exposed).
 #[derive(Clone, Copy, ValueEnum)]
 pub enum Method {
-    /// Create a merge commit (Forgejo `Do: merge`).
+    /// Create a merge commit.
     Merge,
-    /// Rebase the head branch onto the base then fast-forward (Forgejo `Do: rebase`).
+    /// Rebase the head branch onto the base, then fast-forward.
     Rebase,
 }
 
@@ -56,13 +56,11 @@ pub struct Args {
     /// Merge strategy (default: a merge commit). Squash is not offered.
     #[arg(long, value_enum, default_value = "merge")]
     method: Method,
-    /// Keep the head branch after merging. By default the head branch is
-    /// deleted once the merge succeeds.
+    /// Keep the head branch after merging (deleted by default).
     #[arg(long = "keep-branch")]
     keep_branch: bool,
     /// Merge even if the PR is not mergeable, CI is not green, or a review
-    /// requests changes. Also sets Forgejo's `force_merge` so the server does
-    /// not refuse on its own status checks.
+    /// requests changes.
     #[arg(long)]
     force: bool,
 }