Simplify docstrings.

app/model_downloader/net/session.py

@@ -3,7 +3,7 @@
 A single session reuses TLS handshakes and TCP connections across the probe
 and the many segment GETs to the same host (HuggingFace is the dominant
 case), which is a large speedup on cold connections and exactly the
-connection-reuse strategy that lets us match aria2c (PRD section 5.2).
+connection-reuse strategy that lets us match aria2c.
 
 The connector uses :class:`ValidatingResolver` so every connection — initial
 or post-redirect — is screened for private/special-use IPs at connect time.

app/model_downloader/security/allowlist.py

@@ -1,4 +1,4 @@
-"""URL allowlist for server-side model fetches (PRD section 9.1).
+"""URL allowlist for server-side model fetches.
 
 Default-deny. A URL is downloadable only when its parsed host + scheme are
 allowlisted AND (unless explicitly relaxed) its final filename ends in a
@@ -56,8 +56,8 @@ def _allowed_hosts() -> dict[str, set[str]]:
 def is_host_allowed(host: str | None, scheme: str | None) -> bool:
     """True iff ``host`` is allowlisted for ``scheme``.
 
-    Used both for the initial URL and re-checked on every redirect hop
-    (PRD section 9.2), so a whitelisted URL cannot 30x into an off-list host.
+    Used both for the initial URL and re-checked on every redirect hop, 
+    so a whitelisted URL cannot 30x into an off-list host.
     """
     if not host or not scheme:
         return False

app/model_downloader/security/paths.py

@@ -1,4 +1,4 @@
-"""Path resolution + traversal safety for downloads (PRD section 9.3).
+"""Path resolution + traversal safety for downloads.
 
 A ``model_id`` is a *relative destination path* of the form
 ``<directory>/<filename>`` (e.g. ``loras/my_lora.safetensors``). This module

app/model_downloader/security/ssrf.py

@@ -1,4 +1,4 @@
-"""SSRF / exfiltration defenses (PRD section 9.2).
+"""SSRF / exfiltration defenses.
 
 Two cooperating layers: