2013-07-09: Clarify subject prefix.

Clarify subject prefix.

diff --git a/infocalypse/wot.py b/infocalypse/wot.py
--- a/infocalypse/wot.py
+++ b/infocalypse/wot.py
@@ -57,7 +57,7 @@ def send_pull_request(ui, repo, from_ide
     source_text = ui.edit("""
 
 HG: Enter pull request message here. Lines beginning with 'HG:' are removed.
-HG: The first line has "{0}" added before it and is the email subject.
+HG: The first line has "{0}" added before it in transit and is the subject.
 HG: The second line should be blank.
 HG: Following lines are the body of the message.
 """.format(VCS_PREFIX), from_identifier)