Update ToC display text to match CLI category headings

Follow-up to #2998: the anchor links were updated but the display
text still said "Command-line Interface Development" and
"Command-line Tools". Now matches the actual headings.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: vinta

README.md

@@ -75,8 +75,8 @@ An opinionated list of Python frameworks, libraries, tools, and resources.
 
 **CLI & GUI**
 
-- [Command-line Interface Development](#cli-development)
-- [Command-line Tools](#cli-tools)
+- [CLI Development](#cli-development)
+- [CLI Tools](#cli-tools)
 - [GUI Development](#gui-development)
 
 **Text & Documents**