man: Fix .SH and .SS title case

Uppercase .SH titles and lowercase .SS titles.

man/deb-version.5

@@ -88,7 +88,7 @@ is one) to determine the \fIupstream-version\fP and
 \fIdebian-revision\fP compares earlier than the
 presence of one (but note that the \fIdebian-revision\fP
 is the least significant part of the version number).
-.SS Sorting Algorithm
+.SS Sorting algorithm
 The \fIupstream-version\fP and \fIdebian-revision\fP
 parts are compared by the package management system using the
 same algorithm:

man/dpkg-maintscript-helper.1

@@ -58,7 +58,7 @@ it must explicitly do so and \fBdpkg\-maintscript\-helper\fP can be used
 to implement graceful deletion and moving of conffiles within maintainer
 scripts.
 .
-.SS REMOVING A CONFFILE
+.SS Removing a conffile
 .P
 If a conffile is completely removed, it should be removed from disk,
 unless the user has modified it. If there are local modifications, they
@@ -103,7 +103,7 @@ be removed. If the package upgrade aborts, the \fBpostrm\fP reinstalls the
 original conffile. During purge, the \fBpostrm\fP will also delete the
 \fB.dpkg\-bak\fP file kept up to now.
 .
-.SS RENAMING A CONFFILE
+.SS Renaming a conffile
 .P
 If a conffile is moved from one location to another, you need to make sure
 you move across any changes the user has made. This may seem a simple

man/dpkg.1

@@ -61,7 +61,7 @@ any such option the back-ends need to be called directly.
 packages. The information is divided in three classes: \fBstates\fP,
 \fBselection states\fP and \fBflags\fP. These values are intended to
 be changed mainly with \fBdselect\fP.
-.SS PACKAGE STATES
+.SS Package states
 .TP
 .B not\-installed
 The package is not installed on your system.
@@ -88,7 +88,7 @@ The package has been triggered.
 .TP
 .B installed
 The package is unpacked and configured OK.
-.SS PACKAGE SELECTION STATES
+.SS Package selection states
 .TP
 .B install
 The package is selected for installation.
@@ -104,7 +104,7 @@ files, except configuration files).
 .B purge
 The package is selected to be purged (i.e. we want to remove everything
 from system directories, even configuration files).
-.SS PACKAGE FLAGS
+.SS Package flags
 .TP
 .B reinst\-required
 A package marked \fBreinst\-required\fP is broken and requires

man/dselect.1

@@ -223,7 +223,7 @@ Quit \fBdselect\fP
 Exits the program with zero (successful) errorcode.
 .sp
 .
-.SH Package selections management
+.SH PACKAGE SELECTIONS MANAGEMENT
 .sp
 .SS Introduction
 .sp