patch 8.2.1547: various comment problems

Problem:    Various comment problems.
Solution:   Update comments.
diff --git a/src/libvterm/README b/src/libvterm/README
index 3e1ff30..a5b0377 100644
--- a/src/libvterm/README
+++ b/src/libvterm/README
@@ -11,8 +11,11 @@
 - Convert from C99 to C90.
 - Other changes to support embedding in Vim.
 
-To find the diff of a libvterm patch edit this URL, changing "999" to the patch
-number:
+To get the latest version of libvterm you need the "bzr" command and do:
+   bzr co http://bazaar.leonerd.org.uk/c/libvterm/
+
+To find the diff of a libvterm revision edit this URL, changing "999" to the
+patch number:
     https://bazaar.launchpad.net/~libvterm/libvterm/trunk/diff/999?context=3
 
 To merge in changes from Github, do this: