doc: Remove no longer needed comments

Co-authored-by: fanquake <fanquake@gmail.com>

depends/packages/qt.mk

@@ -236,12 +236,7 @@ endef
 #
 # 4. Put our C, CXX and LD FLAGS into gcc-base.conf. Only used for non-host builds.
 #
-# 5. Do similar for the win32-g++ mkspec.
-#
-# 6. In clang.conf, swap out clang & clang++, for our compiler + flags. See #17466.
-#
-# 7. Adjust a regex in toolchain.prf, to accommodate Guix's usage of
-# CROSS_LIBRARY_PATH. See #15277.
+# 5. In clang.conf, swap out clang & clang++, for our compiler + flags. See #17466.
 define $(package)_preprocess_cmds
   cp $($(package)_patch_dir)/qt.pro qt.pro && \
   cp $($(package)_patch_dir)/qttools_src.pro qttools/src/src.pro && \