arch: Clarify column descriptions in table files

Prompted-by: Wookey <wookey@debian.org>

abitable

@@ -3,8 +3,8 @@
 # If the ABI is not present here then the attribute information for a
 # Debian triplet matches the one on the cputable.
 #
-# Column 1 is the Debian name for the ABI.
-# Column 2 is the size (in bits) of the ABI integers/pointers.
+# - Column 1 is the Debian name for the ABI.
+# - Column 2 is the size (in bits) of the ABI pointers.
 #
 # <Debian name>	<Bits>
 gnuabin32	32

cputable

@@ -4,14 +4,14 @@
 # (from ostable) and CPU name (from this table) after mapping from
 # the Debian triplet (from triplettable).
 #
-# Column 1 is the Debian name for the CPU, used to form the cpu part in
-# the Debian triplet.
-# Column 2 is the GNU name for the CPU, used to output build and host
-# targets in ‘dpkg-architecture’.
-# Column 3 is an extended regular expression used to match against the
-# CPU part of the output of the GNU config.guess script.
-# Column 4 is the size (in bits) of the integers/pointers
-# Column 5 is the endianness (byte ordering in numbers)
+# - Column 1 is the Debian name for the CPU, used to form the cpu part in
+#   the Debian triplet.
+# - Column 2 is the GNU name for the CPU, used to output build, host and
+#   target variables in ‘dpkg-architecture’.
+# - Column 3 is an extended regular expression used to match against the
+#   CPU part of the output of the GNU config.guess script.
+# - Column 4 is the size (in bits) of pointers.
+# - Column 5 is the endianness (byte ordering in numbers).
 #
 # <Debian name>	<GNU name>	<config.guess regex>	<Bits>	<Endianness>
 i386		i686		(i[34567]86|pentium)	32	little

debian/changelog

@@ -21,6 +21,7 @@ dpkg (1.18.7) UNRELEASED; urgency=medium
   * Architecture support:
     - Bump the GNU triplet cpu from i386 to i686 to match toolchain changes.
       Thanks to Ben Hutchings <ben@decadent.org.uk>. Closes: #823619
+    - Clarify column descriptions in architecture table files.
   * Perl modules:
     - Relax dependency restrictions parsing to allow again sloppy spaces
       around versions, architectures and profile restrictions.

ostable

@@ -4,12 +4,12 @@
 # (from this table) and CPU name (from cputable) after mapping from
 # the Debian triplet (from triplettable).
 #
-# Column 1 is the Debian name for the system, used to form the system part
-# in the Debian triplet.
-# Column 2 is the GNU name for the system, used to output build and host
-# targets in ‘dpkg-architecture’.
-# Column 3 is an extended regular expression used to match against the
-# system part of the output of the GNU config.guess script.
+# - Column 1 is the Debian name for the system, used to form the system part
+#   in the Debian triplet.
+# - Column 2 is the GNU name for the system, used to output build, host and
+#   target variables in ‘dpkg-architecture’.
+# - Column 3 is an extended regular expression used to match against the
+#   system part of the output of the GNU config.guess script.
 #
 # <Debian name>		<GNU name>		<config.guess regex>
 uclibceabi-linux	linux-uclibceabi	linux[^-]*-uclibceabi