doc: add a vercmp manpage

This includes info on version comparison that is very similar to the stuff
in the pacman manpage, but also a few vercmp examples, the return values,
and other fun stuff.

Also update the version comparison stuff in the pacman manpage.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/doc/pacman.8.txt b/doc/pacman.8.txt
index 2b47a88c..8f91e408 100644
--- a/doc/pacman.8.txt
+++ b/doc/pacman.8.txt
@@ -80,8 +80,10 @@ to determine which packages need upgrading. This behavior operates as follows:
   Numeric:
     1 < 1.0 < 1.1 < 1.1.1 < 1.2 < 2.0 < 3.0.0
 +
-Additionally, packages can have an 'epoch' value defined that will override any
-version comparison and force an upgrade.
+Additionally, version strings can have an 'epoch' value defined that will
+overrule any version comparison (unless the epoch values are equal). This is
+specified in an `epoch:version-rel` format. For example, `2:1.0-1` is always
+greater than `1:3.6-1`.
 
 *-T, \--deptest*::
 	Check dependencies; this is useful in scripts such as makepkg to check