man: Clarify when some features where added

The version information was in a confusing place, move closer to the
added feature, and add missing version information.

debian/changelog

@@ -7,6 +7,7 @@ dpkg (1.18.2) UNRELEASED; urgency=low
       Thanks to Chris Lamb <lamby@debian.org>. Closes: #787616
     - Use the feature area name in the dpkg-buildflags(1) subsection title.
     - Document DPKG_HOOK_ACTION also in dpkg(1) ENVIRONMENT section.
+    - Clarify when some features where added in man pages.
 
   [ Updated programs translations ]
   * Dutch (Frans Spiesschaert). Closes: #789097

man/dpkg-buildflags.1

@@ -75,8 +75,8 @@ information about them.
 .TP
 .BI \-\-status
 Display any information that can be useful to explain the behaviour of
-\fBdpkg\-buildflags\fP: relevant environment variables, current vendor,
-state of all feature flags (since dpkg 1.16.5).
+\fBdpkg\-buildflags\fP (since dpkg 1.16.5): relevant environment variables,
+current vendor, state of all feature flags.
 Also print the resulting compiler flags with their origin.
 
 This is intended to be run from \fBdebian/rules\fP, so that the build log

man/dpkg-buildpackage.1

@@ -372,8 +372,8 @@ will be ignored.
 .TP
 .B DEB_BUILD_PROFILES
 If set, it will be used as the active build profile(s) for the package
-being built.
-It is a space separated list of profile names (since dpkg 1.17.2).
+being built (since dpkg 1.17.2).
+It is a space separated list of profile names.
 Overridden by the \fB\-P\fP option.
 
 .SS Reliance on exported environment flags

man/dpkg.1

@@ -631,7 +631,9 @@ installed.
 Set an invoke hook \fIcommand\fP to be run via \*(lqsh \-c\*(rq before or
 after the \fBdpkg\fP run for the \fIunpack\fP, \fIconfigure\fP, \fIinstall\fP,
 \fItriggers\-only\fP, \fIremove\fP, \fIpurge\fP, \fIadd\-architecture\fP and
-\fIremove\-architecture\fP \fBdpkg\fP actions (since dpkg 1.15.4). This
+\fIremove\-architecture\fP \fBdpkg\fP actions (since dpkg 1.15.4;
+\fIadd\-architecture\fP and \fIremove\-architecture\fP actions
+since dpkg 1.17.19). This
 option can be specified multiple times. The order the options are specified
 is preserved, with the ones from the configuration files taking precedence.
 The environment variable \fBDPKG_HOOK_ACTION\fP is set for the hooks to the