docs(changelog): name the referent, and fix the blank lines

The http-module bullet said "the retry policy above", which was true where it
sat under [Unreleased] -- directly below the Fixed entry describing it. Keep a
Changelog puts Removed before Fixed, so after the fold the nearest thing above
is the session removal and the retry policy is below. Exactly what "relocated,
not edited" missed: a positional reference does not survive reordering. Now
names what it points at.

Also collapses two double blank lines -- between the Removed bullets, and
between [Unreleased] and [0.11.0] -- to match every other gap in the file.

Author: anoop-narang

CHANGELOG.md

@@ -7,7 +7,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-
 ## [0.11.0] - 2026-08-11
 
 ### Changed
@@ -44,10 +43,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   signatures — a `session_id=` parameter, a `session_id` metadata key — need to
   remove it from theirs too, which makes their own release breaking in turn.
 
-
 - `hotdata_framework.http` and `default_http_retries()`. The module existed only
-  to build the retry policy above and had no other callers. It predates
-  `hotdata._retry`, which supersedes it.
+  to build the `retries=` policy removed under Fixed below, and had no other
+  callers. It predates `hotdata._retry`, which supersedes it.
 
 ### Fixed