Porting/git-deltatool: add `--mode summary --type blocking` example

Add an example of `git-deltatool --mode summary --type blocking`
usage. It's what you use for getting the list of commits that you
marked as needing help with.

diff --git a/Porting/git-deltatool b/Porting/git-deltatool
index 9213277..315cb7b 100644 (file)
--- a/Porting/git-deltatool
+++ b/Porting/git-deltatool
@@ -783,6 +783,10 @@ git-deltatool - Annotate commits for perldelta
 
  $ git-deltatool --mode render
 
+ # Get a list of commits needing further review, e.g. for peer review
+
+ $ git-deltatool --mode summary --type blocking
+
  # mark 'pending' annotations as 'done' (i.e. added to perldelta)
 
  $ git-deltatool --mode update --type pending --status done