Sync coreutils and LDP_man-pages submodules

READMEs of the submodules have been updated.

diff --git a/manual/GNU_coreutils b/manual/GNU_coreutils
index 42be005..4c12a52 160000 (submodule)
--- a/manual/GNU_coreutils
+++ b/manual/GNU_coreutils
@@ -1 +1 @@
-Subproject commit 42be0051f9a07b8ddf11f675436a66df91aa39b1
+Subproject commit 4c12a527cf5e0e56b359f5bc1ce7f5da6e46a675

diff --git a/manual/LDP_man-pages b/manual/LDP_man-pages
index 43290de..83f9e5d 160000 (submodule)
--- a/manual/LDP_man-pages
+++ b/manual/LDP_man-pages
@@ -1 +1 @@
-Subproject commit 43290dec20d231da9593568a8cc5b0e9a10b9bda
+Subproject commit 83f9e5d087c3464d5131604d3c9893479e6228eb