Fix header syntax

rimi0108 · rimi0108 · commit eee6ba221485 · 2025-08-15T16:53:28.000+09:00
diff --git a/Doc/library/cmdlinelibs.rst b/Doc/library/cmdlinelibs.rst
@@ -1,7 +1,7 @@
 .. _cmdlinelibs:
 
 ********************************
-Command Line Interface Libraries
+Command-Line interface libraries
 ********************************
 
 The modules described in this chapter assist with implementing
diff --git a/Doc/library/frameworks.rst b/Doc/library/frameworks.rst
@@ -3,7 +3,7 @@
 .. _frameworks:
 
 ******************
-Program Frameworks
+Program frameworks
 ******************
 
 This chapter is no longer maintained, and the modules it contained have been moved to their respective topical documentation.
diff --git a/Doc/library/tk.rst b/Doc/library/tk.rst
@@ -1,7 +1,7 @@
 .. _tkinter:
 
 *********************************
-Graphical User Interfaces with Tk
+Graphical user interfaces with Tk
 *********************************
 
 .. index::
