docs(#2671): trim per-verb arg help (pr-create, comments, ci-log, ci-rerun)

Drop implementation detail from the clap arg help (the `<verb> --help`
surface) — which API/endpoint, page-count math, persisted-vs-streamer
log-source internals, refspec shapes — keeping only what/when-to-use for
each flag. Module `//!` docs (dev-facing, not shown by `--help`) left
intact.

hive-forge/src/verbs/ci_log.rs

@@ -30,20 +30,17 @@ use crate::client::Client;
 
 #[derive(ClapArgs)]
 pub struct Args {
-    /// Workflow run number — the `runs/<n>` in the run-page URL, which
-    /// `pr-status` surfaces as a CI context's `target_url`.
+    /// Workflow run number — the `runs/<n>` in the run-page URL (shown
+    /// by `pr-status`).
     #[arg(long)]
     run: u64,
-    /// Job index within the run (0-based; default 0 — the first job).
+    /// Job index within the run (0-based, default 0).
     #[arg(long, default_value_t = 0)]
     job: u64,
     /// Print only this step's log (0-based). Omit to print every step.
-    /// Honored on the live-streamer path only; the durable persisted-log
-    /// fallback serves a flat whole-job log and ignores `--step`.
     #[arg(long)]
     step: Option<usize>,
-    /// Run attempt number for the durable persisted-log download (re-runs
-    /// increment it; default 1 covers the common single-attempt case).
+    /// Run attempt number (re-runs increment it; default 1).
     #[arg(long, default_value_t = 1)]
     attempt: u64,
 }