man: Do not use header when format or field is meant

debian/changelog

@@ -9,6 +9,7 @@ dpkg (1.17.0) UNRELEASED; urgency=low
   * Add compression development packages to libdpkg-dev Depends.
   * Disable justification and hyphenation in SEE ALSO man page sections.
   * Remove unneeded double quotes in .SH man page headings.
+  * Do not use “header” when “format” or “field” is meant in man pages.
 
  -- Guillem Jover <guillem@debian.org>  Fri, 03 Aug 2012 13:21:00 +0200
 

man/dpkg-buildflags.1

@@ -120,7 +120,7 @@ Print the features enabled for a given area. The only currently recognized
 area is \fBhardening\fP. Exits with 0 if the area is known otherwise exits
 with 1.
 .IP
-The output format is RFC822 header-style, with one section per feature.
+The output is in RFC822 format, with one section per feature.
 For example:
 .IP
 .nf

man/update-alternatives.8

@@ -436,7 +436,7 @@ Path to this block's alternative.
 Value of the priority of this alternative.
 .TP
 .BI Slaves: " list-of-slaves"
-When this header is present, the \fBnext\fR lines hold all slave alternatives
+When this field is present, the \fBnext\fR lines hold all slave alternatives
 associated to the master link of the alternative. There is one slave per
 line. Each line contains one space, the generic name of the slave
 alternative, another space, and the path to the slave alternative.