man: Unify WARNING and ERROR sections into DIAGNOSTICS

debian/changelog

@@ -20,6 +20,7 @@ dpkg (1.17.0) UNRELEASED; urgency=low
     - Fold BACKWARD COMPATIBILITY section into other sections.
     - Document since when DEB_*_MULTIARCH variables are supported.
     - Move compiler flags subsection from ENVIRONMENT to NOTES.
+    - Unify WARNING and ERROR sections into DIAGNOSTICS.
   * Use colon instead of dot for user:group in dpkg debug output.
   * Remove support for obsolete DM-Upload-Allowed from Dpkg::Vendor::Debian.
   * Fix update-alternatives to use the current alternative link as the first

man/dpkg-shlibdeps.1

@@ -240,7 +240,8 @@ Show the usage message and exit.
 .BR \-\-version
 Show the version and exit.
 .
-.SH WARNINGS
+.SH DIAGNOSTICS
+.SS Warnings
 Since
 .B dpkg\-shlibdeps
 analyzes the set of symbols used by each binary of the generated package,
@@ -283,7 +284,7 @@ problem but some small performance improvements in binary load time can be
 obtained by not linking this library to this binary. This warning checks
 the same information than the previous one but does it for each binary
 instead of doing the check globally on all binaries analyzed.
-.SH ERRORS
+.SS Errors
 .B dpkg\-shlibdeps
 will fail if it can't find a public library used by a binary or if this
 library has no associated dependency information (either shlibs file or

man/dpkg-source.1

@@ -669,7 +669,7 @@ don't have any non-ignored uncommitted changes.
 Then the VCS specific part of the source directory is copied over to a
 temporary directory. Before this temporary directory is packed in a tarball,
 various cleanup are done to save space.
-.SH WARNINGS AND ERRORS
+.SH DIAGNOSTICS
 .SS no source format specified in debian/source/format
 The file \fBdebian/source/format\fP should always exist and indicate the
 desired source format. For backwards compatibility, format "1.0" is