Fix file names (#2083)

diff --git a/docs/README.md b/docs/README.md
index 06b8cb4..8dd9eed 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -25,9 +25,9 @@
 - imgui_widgets.cpp
 - imgui_internal.h
 - imconfig.h (empty by default, user-editable)
-- stb_rect_pack.h
-- stb_textedit.h
-- stb_truetype.h
+- imstb_rect_pack.h
+- imstb_textedit.h
+- imstb_truetype.h
 
 No specific build process is required. You can add the .cpp files to your project or #include them from an existing file.