Trim the v2.1.0 notes and correct Relationships in the earlier ones

Changelogs/v2.1.0-RC.1.md

@@ -14,7 +14,7 @@ the stable channel with no reinstall: this build supersedes the last beta.
 - **Multi-tab content navigation** with a window tab bar and per-tab history
 - **Generic type specialization** — inspect Swift generics with concrete arguments filled in
 - **Background indexing** — the sidebar is ready when you click into it, not seconds later
-- **Inspector → Relationships** — see who references a type, and what a type depends on
+- **Inspector → Relationships** — a class's subclasses, a protocol's conforming types
 - **Batch export** interfaces for multiple images in one pass
 - **Theme settings** with a data-driven color model and a built-in Xcode preset
 - **Jump to Definition** for Swift type references
@@ -42,9 +42,10 @@ interface alongside the original unspecialized form.
   silently producing garbage.
 
 #### Inspector → Relationships
-A new **Relationships** tab sits between *Hierarchy* and *Specialization*. It
-lists inbound references (who uses this type) and outbound references (what
-this type depends on), drawn across every binary the document has loaded.
+A new **Relationships** tab sits between *Hierarchy* and *Specialization*.
+Select a class to list its direct subclasses; select a protocol to list the
+types conforming to it. Results are gathered across every indexed image, not
+just the one defining the type.
 
 #### Jump to Definition for Swift types
 Command-click a Swift type reference in the content view to navigate to its

Changelogs/v2.1.0-beta.2.md

@@ -14,12 +14,12 @@ This is a `beta` build — only clients that opted in via
 
 ### Inspector → Relationships
 A new **Relationships** tab sits between *Hierarchy* and *Specialization* and
-shows where a type is referenced across the binaries you have loaded.
+shows what else in the loaded binaries builds on a type.
 
-- Surfaces inbound references (who uses this type) and outbound references
-  (what this type depends on), drawn from a dedicated relationships engine.
-- Works across binaries: if the indexed images include the consumers of a
-  type, they show up regardless of which dylib defines it.
+- Select a class to list its direct subclasses; select a protocol to list the
+  types conforming to it.
+- Works across binaries: matches show up regardless of which dylib defines
+  them, as long as their image has been indexed.
 - The list lays out cleanly even when a type has no relationships — an empty
   state explains why instead of showing a blank tab.