docs: README example matches actual injected content

Author: rolandmarg

README.md

@@ -21,12 +21,11 @@ Markdown files in `.claude/lorebook/` (project) or `~/.claude/lorebook/` (global
 ---
 keys: [lorebook]  # trigger keywords
 ---
-Body below is injected before your prompt when
-keywords match (does not break prompt cache).
-Create .md entries with YAML frontmatter: keys,
-exclude_keys, priority, enabled. Matching is
-case-insensitive with word boundaries.
-`lorebook test` to verify.
+Lorebook injects context into prompts when
+keywords match. Create .md entries with YAML
+frontmatter: keys, exclude_keys, priority,
+enabled. Case-insensitive, word-boundary
+matching. `lorebook test` to verify.
 https://github.com/rolandmarg/lorebook
 ```