housekeeping after min-kernel bump

Update the rationale for min-kernel in hostreqs.  Add a note in
general.ent about the EOL of current min-kernel.  Realign the
backslashes in glibc instructions.

chapter02/hostreqs.xml

@@ -93,8 +93,11 @@
       <para>The reason for the kernel version requirement is that we specify
       that version when building <application>glibc</application> in
       <xref linkend="chapter-cross-tools"/> and
-      <xref linkend="chapter-building-system"/>,
-      at the recommendation of the developers.</para>
+      <xref linkend="chapter-building-system"/>, so the workarounds for
+      older kernels are not enabled and the compiled
+      <application>glibc</application> is slightly faster and smaller.
+      As at June 2023, &min-kernel; is the oldest kernel release still
+      supported by the kernel developers.</para>
 
       <para>If the host kernel is earlier than &min-kernel; you will need to replace
       the kernel with a more up-to-date version. There are two ways

chapter05/glibc.xml

@@ -89,7 +89,7 @@ cd       build</userinput></screen>
       --prefix=/usr                      \
       --host=$LFS_TGT                    \
       --build=$(../scripts/config.guess) \
-      --enable-kernel=&min-kernel;                \
+      --enable-kernel=&min-kernel;               \
       --with-headers=$LFS/usr/include    \
       libc_cv_slibdir=/usr/lib</userinput></screen>
 

chapter08/glibc.xml

@@ -76,7 +76,7 @@ cd       build</userinput></screen>
 
 <screen><userinput remap="configure">../configure --prefix=/usr                            \
              --disable-werror                         \
-             --enable-kernel=&min-kernel;                      \
+             --enable-kernel=&min-kernel;                     \
              --enable-stack-protector=strong          \
              --with-headers=/usr/include              \
              libc_cv_slibdir=/usr/lib</userinput></screen>

general.ent

@@ -91,7 +91,11 @@
 <!ENTITY livecd-root     "&lfs-root;livecd/">
 <!ENTITY test-results    "&lfs-root;lfs/build-logs/&generic-version;/">
 <!ENTITY secadv          "&lfs-root;lfs/advisories/">
+
+<!-- 4.14 EOL is Jan 2024
+     so for LFS 11.5 we may consider moving to 4.19 -->
 <!ENTITY min-kernel      "4.14">
+
 <!--
 <!ENTITY patches-rootd   "&lfs-root;patches/lfs/&generic-versiond;/">
 <!ENTITY downloads-rootd "&lfs-root;lfs/downloads/&generic-versiond;/">